Numbers 21:13-15 describes the Arnon boundary — the geographical basis Jephthah uses to counter Ammon's claim.

Numbers 21:27-30 recounts Israel's victory over Sihon — showing the land taken from Amorites, not Ammon.

Deuteronomy 2:9 records God's command not to take Moab's land — supporting Jephthah's denial of taking Ammon's land.

Deuteronomy 2:19 forbids taking Ammon's land — directly backing Jephthah's argument.

2 Chronicles 20:10 recalls God's prohibition against invading Ammon — reinforcing Jephthah's case.

Deuteronomy 2:37 records Israel avoiding Ammonite land — the same territory Jephthah later claims Israel never took.