Genesis 19:34-36

New Revised Standard Version Catholic Edition

³⁴ On the next day, the firstborn said to the younger, “Look, I lay last night with my father; let us make him drink wine tonight also; then you go in and lie with him, so that we may preserve offspring through our father.” ³⁵ So they made their father drink wine that night also; and the younger rose, and lay with him; and he did not know when she lay down or when she rose. ³⁶ Thus both the daughters of Lot became pregnant by their father.