And the first born bare a son, and called his name Moab: the same is the father of the Moabites unto this day.
After Lot's daughters flee Sodom's destruction, the elder bears a son who becomes ancestor of the Moabites.
Genesis 19:37
King James Version (public domain)
Traditionally attributed to Moses · c. 13th century BC · The Pentateuch — Genesis, Exodus, Leviticus, Numbers, and Deuteronomy — is traditionally attributed to him
Context
35And 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.
36Thus were both the daughters of Lot with child by their father.
37And the first born bare a son, and called his name Moab: the same is the father of the Moabites unto this day.
38And the younger, she also bare a son, and called his name Benammi: the same is the father of the children of Ammon unto this day.