Lot was afraid to stay too long in Zoar, so he and his daughters settled in a cave in the hill country.
“Father’s old,” the older daughter said to her sister. “Consider the fact that we’re hiding out in a cave. No man will come and take us for wives.”
The older daughter said, “Let’s get him drunk and sleep with him. This way we can keep our family tree going.”
That night, they served their father more wine than usual, and when he was barely conscious, the older daughter went to bed with him. Lot never knew a thing.
The next day, she said to the younger daughter, “It’s your turn tonight.” Again they served too much wine, and Lot became very drunk. The younger daughter went in and had sex with him. Once again, Lot knew nothing about it.
Both daughters conceived sons with their father. Moab, the patriarch of Moabites, was born of the older daughter, and Ben-Ammi, the patriarch of Ammonites, was born of the younger.
Inspiration: Genesis 19