Genesis 19:33-35

Revised Standard Version

³³ So they made their father drink wine that night; and the first-born went in, and lay with her father; he did not know when she lay down or when she arose. ³⁴ And on the next day, the first-born 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, that we may preserve offspring through our father.” ³⁵ So they made their father drink wine that night also; and the younger arose, and lay with him; and he did not know when she lay down or when she arose.