Genesis 19:35-37

New American Standard Bible

³⁵ So they had their father drink wine that night too, and the younger got up and slept with him; and he did not know when she lay down or got up. ³⁶ And so both of the daughters of Lot conceived by their father. ³⁷ The firstborn gave birth to a son, and named him ^(A)Moab; he is the father of the Moabites to this day.