Chapter 19:
The destruction of Sodom and Gomorrah
The birth of Moab and Ammon, descendants of Lot.
Chapter 20:
Abraham and Sarah do not reveal their true relationship to Abimelech, King of Gerar.
Chapter 21:
The birth of Isaac to Abraham at 100 years old. Hagar and Ishmael sent away, since Ishmael cannot inherit with Isaac.
Abimelech and Abraham make an oath at Beersheba.