Contradiction with Numbers 20:21
This verse contradicts Deuteronomy 2:18 by showing that Edom refused to let Israel pass through their land, which contrasts with the instruction to pass through Ar in the coast of Moab.
Numbers 20:21: Thus Edom refused to give Israel passage through his border: wherefore Israel turned away from him.
Contradiction with Judges 11:17
Contradicts Deuteronomy 2:18 as it states Israel sent messengers to Edom asking for passage, but they were denied, conflicting with the peaceful passing in Deuteronomy.
Judges 11:17: Then Israel sent messengers unto the king of Edom, saying, Let me, I pray thee, pass through thy land: but the king of Edom would not hearken [thereto]. And in like manner they sent unto the king of Moab: but he would not [consent]: and Israel abode in Kadesh.
Contradiction with Deuteronomy 23:3
Contradicts Deuteronomy 2:18 by forbidding Moabites from entering the congregation of the Lord, despite being directed to pass through Moab peacefully.
Deuteronomy 23:3: An Ammonite or Moabite shall not enter into the congregation of the LORD; even to their tenth generation shall they not enter into the congregation of the LORD for ever:
Contradiction with Numbers 21:23
Contradicts Deuteronomy 2:18 by showing Sihon king of the Amorites would not let Israel pass peacefully, leading to a battle, differing from the peaceful passage mentioned.
Numbers 21:23: And Sihon would not suffer Israel to pass through his border: but Sihon gathered all his people together, and went out against Israel into the wilderness: and he came to Jahaz, and fought against Israel.