Now the firstborn said to the younger, "Our father is old, and there is no man on the earth to come in to us as is the custom of all the earth.
Genesis 19:31
Surrounding context
19:30 Then Lot went up out of Zoar and dwelt in the mountains, and his two daughters were with him; for he was afraid to dwell in Zoar. And he and his two daughters dwelt in a cave.
19:31 Now the firstborn said to the younger, "Our father is old, and there is no man on the earth to come in to us as is the custom of all the earth.
19:32 Come, let us make our father drink wine, and we will lie with him, that we may preserve the lineage of our father."