relief checks on green whiskey his children have a way of crying from hunger pains. I don’t know of any landowner around here who begrudges those children any game their father can hit.”

Atticus is compassionate to the plight of the Ewell children, even though they are contemptuous at school and elsewhere, because their father makes no effort to guide them well.

The title of the book actually evolves from a compassionate quote Atticus provides about the treatment of innocent creatures like mockingbirds:

Atticus said to Jem one day, “I’d rather you shot at tin cans in the back yard, but I know you’ll go after birds. Shoot all the bluejays you want, if you can hit ‘em, but remember it’s a sin to kill a mockingbird.”

Atticus is impressing upon his children that they should never harm creatures whose sole influence upon the world is to create beauty. Later this symbol will grow to include Tom Robinson and perhaps even Boo Radley.

Even after Bob Ewell spits in his face and threatens him, Atticus continues to find compassion toward him. When he learns that Bob has been stalking Tom's widow around town, he again finds a way toward empathy:

“It might be because he knows in his heart that very few people in Maycomb really believed his and Mayella’s yarns. He thought he’d be a hero, but all he got for his pain was... was, okay, we’ll convict this Negro but get back to your dump. He’s had his fling with about everybody now, so he ought to be satisfied. He’ll settle down when the weather changes.”

Atticus believes that with his pride injured, Bob is lashing out temporarily but that once he regains his normal footing in town, things will return to normal. Unfortunately, Bob Ewell proves that some people are just rotten to the core.

Atticus is a caring and compassionate father in To Kill a Mockingbird. One quote by Atticus showing compassion can be found in chapter 11 when he is talking with the children about Mrs. Dubose. One day, after Mrs. Dubose hurls a particularly ugly insult at Jem, he proceeds to take Scout's new baton and use it to destroy Mrs. Dubose's camellia bushes. Atticus instructs Jem to speak to Mrs. Dubose, and as retribution, Jem has to read to Mrs. Dubose daily. Soon after, Mrs. Dubose dies. Atticus explains that she was able to kick her morphine addiction because Jem reading to her served as a distraction. Atticus says, "According to her views, she died beholden to nothing and nobody. She was the bravest person I ever knew." He shows compassion to Mrs. Dubose in spite of the things she said about him.

In chapter 15, after Atticus faces the Old Sarum bunch attempting to lynch Tom, he is speaking with the children about the events. Scout is confused because she thinks Mr. Cunningham is Atticus's friend. Atticus explains that Mr. Cunningham is a friend and adds that, "Mr. Cunningham’s basically a good man, he just has his blind spots along with the rest of us." Atticus's statement shows compassion against a man that may have been willing to hurt him in order to get to Tom.

In Chapter 2, Atticus explains to Scout that Walter Cunningham Sr. can not pay him for his services in money. So, he allows Walter to pay in any way he can. Atticus tells him to concentrate on his own problems and pay him back when he can: 

“Let that be the least of your worries, Walter,” Atticus said. 

Walter eventually pays him in goods such as stovewood, hickory nuts, and turnip greens. 

At the end of Chapter 5, Atticus reprimands the children for making fun of Boo Radley. 

“Son,” he said to Jem, “I’m going to tell you something and tell you one time: stop tormenting that man. That goes for the other two of you.” 

Scout adds that if Arthur wanted to come out, he would on his own terms. (One of their goals is to lure Arthur outside.) Atticus knows that Arthur has had a troubled childhood and prefers to stay inside. He doesn't want his children, or Dill, to make Arthur's life any more difficult. 

In Chapter 23, we learn that Bob Ewell has spit on Atticus at the post office. Bob then challenges Atticus to a fight and Atticus walks away saying he is too old to fight. Jem wonders why Atticus won't protect himself or fight back. Atticus replies that he understands why Bob retaliated in this way. Atticus had embarrassed Bob in court and this was Bob's way of getting back at him. Atticus gives Bob a pass on this for another reason. He concludes that if Bob has to take out his anger on someone, he would rather take the abuse than let Mayella or one of the Ewell children take it. This is Chapter 23, about two pages in. He shows understanding for Bob and compassion for Mayella and the Ewell children: 

So if spitting in my face and threatening me saved Mayella Ewell one extra beating, that’s something I’ll gladly take. He had to take it out on somebody and I’d rather it be me than that houseful of children out there. 

Yet another act of compassion in To Kill a Mockingbird occurs when Scout invites the obviously hungry Walter Cunningham Jr. to the Finch house for lunch. Scout is aware that Walter Jr. will have no lunch at school after refusing Miss Caroline's loan of a quarter for school food. So, Scout makes the friendly gesture of inviting the bedraggled boy home for a home-cooked meal by Calpurnia.

Another act of compassion comes from the unseen Boo on the night of the fire when he drapes a blanket across Scout's shoulders to protect her from the cold. Boo had previously shown his kindness to Jem when he awkwardly mended the boy's torn pants and folded them on the fence.

I’m assuming you are looking for acts of compassion or concern by characters in the novel.  The acts of compassion that I always find the most fascinating are the acts of compassion by the novels most mysterious character, Boo Radley. Despite the children’s misconception of him being the equivalent of a monster, he provides the Finch kids treats in the knothole, he provides Scout a blanket during Miss Maudie’s fire, and later saves the children Bob Ewell’s attack. Other acts of compassion abound when we consider Atticus and his role in his community.

There are many, many examples of compassion in this book.  I'll list a few below:

• Atticus being kind to Mrs. Dubose, despite her verbal harrassment of him, and her insulting comments.  He sends Jem to help her through her last days, and tells him that she is "the bravest person I've ever known."
• Atticus in taking the case of Tom Robinson, even though he knew that he would lose, and that it would open his family up to danger and ridicule.  He knew Tom was innocent, and so showed compassion.
• Atticus in questioning Mayella, very kindly paints a picture of her dire life, her loneliness, and alludes to her father's drunkenness.  He tries to help the jury to relate to her and feel pity for her, a very compassionate move.
• Scout shows compassion to Boo at the end by respecting his need for privacy, his shy nature, and his desire to make sure that Jem is okay.  She speaks kindly to him, and doesn't push him out of his comfort zone.
• Boo giving Scout a blanket on the cold night that Miss Maudie's house burns down, AND, the neighbors as they help Miss Maudie as her house burns.

Those are just a few examples, but I hope that they can get you started; good luck!

My favorite example of compassion in To Kill a Mockingbird comes when Scout's Uncle Jack tends to her injuries on Christmas Day. After Cousin Francis calls Scout (and Atticus) a "nigger-lover," Scout

... split my knuckle to the bone on his front teeth.

When Jack arrives to break them up, Scout tries to run, but Jack tackles her and then spanks her, leaving "seven or eight red marks" on her behind. Scout is still angry when Jack tries to talk with her back at the Finch house in Maycomb, but when he finally allows Scout to explain the whole story, Jack is ready to head back to Finch's Landing to deliver another spanking:

"... wait'll I get my hands on that boy..."

Instead, Jack stays to take care of Scout's bloody knuckles, and he "gallantly bowed me to the bathroom." Cleaning and bandaging Scout's hand, Jack "entertained me" with a story about an old man and a cat. But when Scout asked him

     "What's a whore-lady?"

Jack changes the subject and "plunged into another long tale..." 

Although the town of Maycomb is riddled with racial prejudice, injustice, and social snobbery, that's not the whole story of this sleepy Southern town. For in the midst of all this negativity there are good people who regularly display acts of compassion towards others. The most obvious example, of course, would be Atticus. Like all good people, he's able to transcend the limitations of his culture, race, and background to give a shining example to others in how to behave towards other people.

Atticus leads by example, regularly instilling into his children the importance of empathy. For instance, Scout and Jem just see Mrs. Dubose, their neighbor, as an ornery old woman with a vicious tongue. But Atticus shows compassion towards her and wants his children to follow suit. He knows that Mrs. Dubose is a sick old woman who spends most of her days in pain. She is therefore deserving of care not censure.

An unlikely source of compassion later on in the story is Boo Radley. A man who's been turned over the years by local gossip into a figure of urban legend, a scary bogeyman figure, is the last man we'd expect to have a softer side. But Scout and Jem are privileged to witness the real Arthur Radley when he springs into action to save them from the evil clutches of Bob Ewell after he brutally attacks them one night.

Miss Maudie truly embodies compassion as she always finds kind words for people who are deserving of them.

---In Chapter 5, for instance, when Scout inquires about Boo Radley, Miss Maudie demands that Scout refer to the unusual inhabitant of the house across the street as Arthur, for this is his name. Then, after Scout's inquisitive questions about Arthur Radley, Miss Maudie tells Scout that the Radley house is a "sad house," adding compassionately, 

"...I remember Arthur Radley when he was a boy. He always spoke nicely to me, no matter what folks said he did. Spoke as nicely as he knew how."
"You reckon he's crazy?" Scout innocently asks.
"If he's not he should be by now. The things that happen to people we never really know. What happens in houses behind closed doors, what secrets--"

---Another example of Miss Maudie's compassion is found in the second part of the novel, and this time Miss Maudie exercises her empathy with regard to Alexandra, the sister of Atticus Finch, who has become offended by the remarks of the sanctimonious hypocrite Mrs. Merriweather. For, not too subtly, Mrs. Merriweather derogates those who are "misguided" as they think they are doing the right thing by defending Tom Robinson, "but all they did was stir 'em up." She adds that now her maid Sophy acts sultry and "dissatisfied."

While Mrs. Merriweather pauses for a moment, Miss Maudie asks her, "His food doesn't stick going down, does it?"

"Maudie, I'm sure I don't know what you mean," said Mrs. Merriweather.
"I'm sure you do," Miss Maudie said shortly.

Hearing this exchange, Aunt Alexandra gives Miss Maudie a look of pure gratitude for her compassion and respect for Atticus.

Later, Miss Maudie commiserates with Alexandra, who becomes distraught when she learns that Tom Robinson has been shot for his desperate attempt to escape from prison. Further, Alexandra complains that the citizens are tearing her brother Atticus to pieces, and they are willing to let him "do what they're too afraid to do themselves," adding that they are ruining Atticus's health over the current issues.

Miss Maudie again consoles Alexandra:

"Whether Maycomb knows it or not we're paying the highest tribute we can pay a man. We trust him to do right. It's that simple."

SHOULD BOO BE CHARGED WITH MURDER? (Chapter 30)... Scout overhears much of the conversation between Atticus and Sheriff Heck Tate concerning Bob Ewell's death. Tate firmly tells Atticus that his official report would be that Ewell's death was accidental and self-inflicted--that " 'Ewell fell on his knife.' " In this way, Boo would not have to suffer the indignity of a trial. By this time Scout understands that it must have been Boo that saved her and Jem by knifing Bob himself. She told Atticus,

   "Mr. Tate was right."
   Atticus disengaged himself and looked at me. "What do you mean?"
   "Well, it'd be sorta like shootin' a mockingbird, wouldn't it?"

MEETING BOO (Chapter 31)... Scout had finally realized that Boo was not a monster; he was her hero. She had already considered the lonely life he must have experienced shut up inside the Radley house, but now, after meeting him, she had a chance to prove her friendship.

   "Mr. Arthur, bend your arm down here, like that. That's right, sir.
   I slipped my hand into the crook of his arm.
   He had to stoop a little to accommodate me, but if Miss Stephanie Crawford was watching from her upstairs window, she would see Arthur Radley escorting me down the sidewalk, as any gentleman would do.

MISS CAROLINE  (Chapter 3)... Scout never got along with her first grade teacher, Miss Caroline, but she did feel sorry for her (at least a little bit) on her first day of school. After Burris Ewell called her a " 'snot-nosed slut,' " Scout and the rest of the kids tried to console her.

Soon we were clustered around her desk, trying in our various ways to comfort her.

DOLPHUS RAYMOND.  The irascible Mr. Raymond first shares his secret of the paper sack with Scout and Dill before later telling them about how passionate he feels about the treatment of black people.

"Cry about the simple hell people give other people--without even thinking. Cry about the hell white people give colored folks without even stopping to think they're people, too."  (Chapter 20)

MISS MAUDIE.  Following the trial, Jem despairs that Atticus has no supporters in Maycomb. Maudie explains that it isn't so.

"I simply want to tell you that there are some men in this world who were born to do our unpleasant jobs for us. Your father's one of them."  (Chapter 22)

SCOUT.  Like Sheriff Tate, Scout agrees that charging Boo with killing Bob Ewell would be cruel punishment. She explains why to Atticus.

"Mr. Tate was right... it'd be sort of like shootin' a mockingbird, wouldn't it?"  (Chapter 30)

ATTICUS FINCH.  Perhaps the most compassionate moment of the novel comes during Atticus' final summation to the jury at the end of the trial of Tom Robinson.

"... come to a decision and restore this defendant to his family. In the name of God, do your duty... In the name of God, believe him."  (Chapter 20)

You are right.  There are ample amounts of quotes illustrating compassion.

Atticus tells Scout on page 30 "'.  . . if you learn, Scout, you'll get along a lot better with all kinds of folks.  You never really understand a person until you consider things fomr his point of view --.'"  This gets at one of the main themes of the novel: empathy.  Atticus is always striving to have empathy, regardless of who he is dealing with.  Even when Bob Ewell spits in his face, Atticus doesn't get mad.  Instead, he sees things from Ewell's point of view.  As a lawyer, Atticus must do this, but it also reveals a lot about what kind of a man Atticus is.

Another good quote comes during the trial when Scout views Mayella up on the stand and ponders "I wondered if anybody had ever called her 'ma'am' or 'Miss Mayella' in her life; probably not, as she took offense to routine courtesy.  What on earth was her life like?" (182).  Later Scout concludes that she must be one of the loneliest people on earth.  Now, this is not pity coming from Scout.  She is simply offering Mayella what compassion she can.

Finally, a third example is from Aunt Alexandra in Ch. 24 when she is showing compassion for Atticus.  They have battled over many things, but she sees the toll it is taking on him and she tells Miss Maudie, "'I can't say I approve of everything he does, Maudie, but he's my brother, and I just want to know when this will end'" (236).