But the Lord our God had forbidden you to go anywhere near the land of the Ammonites. So you didn’t enter the land along the bank of the Jabbok River or capture the cities in the mountains.
I gave the tribes of Reuben and Gad some of Gilead from the Arnon Valley (the middle of the valley is the border) to the Jabbok River, which is the border of Ammon.
Sihon was the Amorite king who lived in Heshbon. His rule extended from Aroer on the edge of the Arnon Valley to the Jabbok River, which is the border of Ammon. This included the middle of the valley and half of Gilead.
The king of Ammon answered Jephthah’s messengers, “When the people of Israel left Egypt, they took my land. It stretched from the Arnon River to the Jabbok River and the Jordan River. Now give it back peacefully.”