Genesis 19:36-38

Revised Standard Version

³⁶ Thus both the daughters of Lot were with child by their father. ³⁷ The first-born bore a son, and called his name Moab; he is the father of the Moabites to this day. ³⁸ The younger also bore a son, and called his name Ben-ammi; he is the father of the Ammonites to this day.