Genesis 19:34-36

Modern English Version

³⁴ On the next day the firstborn said to the younger, “Indeed, last night I had relations with my father. Let us make him drink wine tonight also, so that you may go in and have relations with him, so that we may preserve the lineage of our father.” ³⁵ So they made their father drink wine that night also. Then the younger arose and lay down with him, and he did not know when she lay down or when she arose.

³⁶ Therefore both the daughters of Lot were pregnant by their father.