Judges 11:18-19
11:18 Then Israel went through the desert and bypassed the land of Edom and the land of Moab. They traveled east of the land of Moab and camped on the other side of the Arnon River; they did not go through Moabite territory (the Arnon was Moab’s border).
11:19 Israel sent messengers to King Sihon, the Amorite king who ruled in Heshbon, and said to him, “Please allow us to pass through your land to our land.”