John Steinbeck's book Of Mice and Men is full of foreshadowing. For example, in the first chapter George tells Lennie to come to this spot by the river and hide in the bushes if he should get into any trouble at the ranch where they are going to work. This is a good indication that Lennie will get into trouble and that he will come back and hide here. Therefore, George knows where to find him at the very end when he kills him.
In the second chapter of the novella, Curley takes a dislike to Lennie, and Candy tells George that Curley hates big guys and is always starting fights with them to prove his manhood. We can be sure that there will be a fight between Curley and Lennie.
In the third chapter, George tells Slim about the trouble they had in Weed when Lennie wouldn't let go of a girl's dress and she started screaming. This foreshadows the much more serious trouble Lennie will have with Curley's wife.
Even the title of the book seems to foreshadow the outcome of the story. George and Lennie's "best laid plans" will end in disaster, as did the best laid plans of the hapless mouse in Robert Burns' touching poem.
For example, in Macbeth by Shakespeare, there are loads of examples of foreshadowing in the opening witches' chant alone.
The sentence 'fair is foul and foul is fair' shows how Macbeth changes from fair (uncorrupted) to foul (murderer).
The sentence 'Here to meet with Macbeth' also foreshadows Macbeth's visit to the witches later in the play.
There are loads more in modern literature, especially in Roald Dahl. He's the mastermind for clues etc. Read "The Landlady" and you'll see what I mean.