Genesis 19-21

Genesis 19
Angels appear to Lot. He invites them in and attempts to protect them from people outside.
Lot is overrun.
The angels tell lot to take his family and leave because God is going to destroy Sodom.
Lot's wife turns back as the angels are destroying the city and becomes a pillar of salt.
Lot's daughters deceive him into having children to preserve their father's lineage.

Genesis 20
Abraham lies and says Sarah is her sister.
The King of the land they are in asks to lay with Sarah.
The Lord rebukes the King for what he has done.
Sarah is restored as Abraham's wife.

Genesis 21
Abraham and Sarah have a son, Isaac, as the Lord promised.
Abraham sends Hagar and Ismael their son away.
They run out of water but the Lord provided for them and bless Hagar's son.