Genesis 19:30-31

30Now Lot went up from Zoar with his two daughters and 1stayed in the 2mountains, because he was afraid to stay in Zoar; and he stayed in a cave, he and his two daughters.

31Then the firstborn said to the younger, “Our father is old, and there is not a man 3on earth to 45have relations with us according to the custom of all the earth.