Genesis 19:38 WBT

³⁶  Thus were both the daughters of Lot with child by their father.

³⁷  And the first-born bore a son, and called his name Moab: the same [is] the father of the Moabites to this day.

³⁸  And the younger, she also bore a son, and called his name Ben-ammi: the same [is] the father of the children of Ammon to this day.