Genesis 19:34

The next day, the firstborn said to the younger, "Behold, I lay last night with my father. Let us make him drink wine tonight also. Then you go in and lie with him."

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