Genesis 19:36 KJV
Thus were both the daughters of Lot with child by their father.
Genesis 19:36, King James Version
In context
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.