Genesis 19:34-38

34The next day the older daughter said to her younger sister, ‘Last night I had sex with my father. We should make him drunk with wine again tonight. Then you can have sex with him. As a result, our father's family will continue.’

35So that night, they caused their father to become drunk again. The younger daughter had sex with her father. He did not know when she came to him. And he did not know when she left him.

36In that way, Lot caused both of his daughters to become pregnant.

37The older daughter gave birth to a son. She called him Moab. He became the ancestor of the Moabites.

38The younger daughter also gave birth to a son. She called him Ben-Ammi. He became the ancestor of the Ammonites.