Genesis 19:30-38

³⁰ Lot went up out of Zoar, and lived in the mountain, and his two daughters with him; for he was afraid to live in Zoar. He lived in a cave with his two daughters.

³¹ The firstborn said to the younger, “Our father is old, and there is not a man in the earth to come in to us in the way of all the earth.

³² Come, let’s make our father drink wine, and we will lie with him, that we may preserve our father’s family line.”

³³ They made their father drink wine that night: and the firstborn went in, and lay with her father. He didn’t know when she lay down, nor when she arose.

³⁴ It came to pass on the next day, that the firstborn said to the younger, “Behold, I lay last night with my father. Let’s make him drink wine again tonight. You go in, and lie with him, that we may preserve our father’s family line.”

³⁵ They made their father drink wine that night also. The younger went and lay with him. He didn’t know when she lay down, nor when she got up.

³⁶ Thus both of Lot’s daughters were with child by their father.

³⁷ The firstborn bore a son, and named him Moab. He is the father of the Moabites to this day.

³⁸ The younger also bore a son, and called his name Ben Ammi. He is the father of the children of Ammon to this day.