Genesis 19:36-38 New Living Translation (NLT)

36. As a result, both of Lot’s daughters became pregnant by their own father.

37. When the older daughter gave birth to a son, she named him Moab. He became the ancestor of the nation now known as the Moabites.

38. When the younger daughter gave birth to a son, she named him Ben-ammi. He became the ancestor of the nation now known as the Ammonites.

Genesis 19