Genesis 19 - The two angels went to Sodom and were welcomed by Lot but threatened with a sadistic attack by the men of the city. The angels blind the men and rescue Lot and his family. God sends "fire and brimstone" on the cities of Sodom and Gomorrah. Lot's wife looks back and is turned into a pillar of salt. Lot and his daughters escape to a cave where his daughters get pregnant by him. There is a sad story in Lot's life that can be very instructive to believers who are enticed by the pleasures of this world.
Genesis 20 - Abraham dwells in Abimelech's land and once again has Sarah lie about her relationship with him. When Abimelech takes Sarah to his home God warns him to return her to Abraham. Abraham is rebuked for his cowardice and Abimelech returns Sarah.
Genesis 21 - Sarah gives birth to Isaac and then has Abraham "cast out" Hagar and Ishmael. Though this is harsh, it is used of God to fulfill His purposes. God promises Hagar that He will watch over her and her child and that Ishmael's descendants will form a nation.