Then Israel traveled through the wilderness and bypassed the lands of Edom and Moab. They came to the east side of the land of Moab and camped on the other side of the Arnon. But they did not enter the territory of Moab, since the Arnon was its border.

Numbers 21:4
Then they set out from Mount Hor along the route to the Red Sea, in order to bypass the land of Edom. But the people grew impatient on the journey

Numbers 21:13
From there they moved on and camped on the other side of the Arnon, in the wilderness that extends into the Amorite territory. Now the Arnon is the border between the Moabites and the Amorites.

Deuteronomy 2:8
So we passed by our brothers, the descendants of Esau, who live in Seir. We turned away from the Arabah road, which comes up from Elath and Ezion-geber, and traveled along the road of the Wilderness of Moab.

Deuteronomy 2:9
Then the LORD said to me, "Do not harass the Moabites or provoke them to war, for I will not give you any of their land, because I have given Ar to the descendants of Lot as their possession."

Deuteronomy 2:18
"Today you are going to cross the border of Moab at Ar.

Deuteronomy 2:24
"Arise, set out, and cross the Arnon Valley. See, I have delivered into your hand Sihon the Amorite, king of Heshbon, and his land. Begin to take possession of it and engage him in battle.

Then they went along through the wilderness, and compassed the land of Edom, and the land of Moab, and came by the east side of the land of Moab, and pitched on the other side of Arnon, but came not within the border of Moab: for Arnon was the border of Moab.