Genesis 19:30

27 Abraham went up early in the morning to the place where he had stood before the LORD.

28 He looked toward Sodom and Gomorrah, and toward all the land of the plain, and saw that the smoke of the land went up as the smoke of a furnace.

29 When God destroyed the cities of the plain, God remembered Abraham, and sent Lot out of the middle of the overthrow, when he overthrew the cities in which Lot lived.

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.