Genesis 19:35 And they made their father drink wine that night also: and the younger arose, and lay with him; and he perceived not when she lay down, nor when she arose.

35 And they made their father drink wine that night also: and the younger arose, and lay with him; and he perceived not when she lay down, nor when she arose. 36 Thus were both the daughters of Lot with child by their father. 37 And the firstborn bare a son, and called his name Moab: the same is the father of the Moabites unto this day. 38 And the younger, she also bare a son, and called his name Benammi: the same is the father of the children of Ammon unto this day.