Genesis 19:37
And the firstborn bare a son, and called his name Moab: the same is the father of the Moabites unto this day.
Cross-reference
In Deuteronomy 2:9, God explicitly calls the Moabites 'descendants of Lot' and gives them their land — directly confirming this origin story.
Jeremiah 48:1 is a prophecy against Moab, connecting the nation's origin in sin to its later judgment.
In Numbers 24:17, Balaam prophesies a ruler who will crush Moab's foreheads — the nation from Lot's daughter under prophetic judgment.
In Ruth 4:10, Ruth is identified as 'the Moabitess' who enters David's lineage — a descendant of this very nation joining Israel's royal line.
In Numbers 21:29, Chemosh is named as Moab's god and Moab suffers destruction under Sihon — the nation born from Lot's daughter now under judgment.
In Numbers 22:1-41, Balak king of Moab hires Balaam to curse Israel — the nation born from Lot's older daughter now opposes God's people.
In Deuteronomy 23:3, Moabites are banned from the assembly of the LORD — the nation born from Lot now permanently excluded from Israel's worship.
Psalm 83:8 identifies Moab with Israel's enemies, showing how the nation born here became a persistent antagonist.