Genesis 19:32-34
32
Come, let's make our father drink wine, and we will lie with him, that we may preserve our father's seed."
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 us make him drink wine again, tonight. You go in, and lie with him, that we may preserve our father's seed."
