"Sinners in the Hands of an Angry God" is a sermon the Puritan preacher Jonathan Edwards preached to a rather stubborn church during what is known as the Great Awakening in America. Though it is a fiery sermon full of vivid imagery, he preached it without any theatrics or particular animation, believing the word of God would be effective without it--and he was right.
The last lines of this famous sermon include an allusion, which of course is a reference to something outside of the text. In this case, it is a biblical reference to a story found in Genesis, the story of what happened to Lot and his family when God destroyed Sodom and Gomorrah:
The wrath of Almighty God is now undoubtedly hanging over a great part of this congregation. Let every one fly out of Sodom: "Haste and escape for your lives, look not behind you, escape to the mountain, lest you be consumed."
The Bible story to which Edwards refers is found in Genesis 26:15-17, when God vows to destroy the cities of Sodom and Gomorrah because they have become so full of evil. God agrees to save the city if there are at least a few good people there, but Lot and his family are the only good people left. When God sends angels in the form of men to the Sodom, the depravity is so great that the people would have mistreated the men horribly and then killed them; however, Lot saves them.
When the destruction is imminent,
the angels urged Lot to hurry, saying, “Arise, take your wife and your two daughters who are here, lest you be consumed in the punishment of the city.” And while he lingered, the men [angels] took hold of his hand, his wife’s hand, and the hands of his two daughters, the Lord being merciful to him, and they brought him out and set him outside the city. So it came to pass, when they had brought them outside, that he said, “Escape for your life! Do not look behind you nor stay anywhere in the plain. Escape to the mountains, lest you be destroyed.”
In this sermon, Edwards is doing what the angels in the form of men did to Lot; he is warning the people of this congregation that their destruction is imminent and they had better escape the destruction while they still have the chance to do so. In the Bible story, Lot's family escapes, but his wife looks back and is turned into a pillar of salt. God "rained brimstone and fire" on the two cities and the people, as well as everything that was growing nearby, were destroyed.