Genesis 19:36-38

New Revised Standard Version, Anglicised

³⁶ Thus both the daughters of Lot became pregnant by their father. ³⁷ The firstborn bore a son, and named him Moab; he is the ancestor of the Moabites to this day. ³⁸ The younger also bore a son and named him Ben-ammi; he is the ancestor of the Ammonites to this day.