And to the tribes of Reuben and Gad I assigned the territory from Gilead to the Arnon River. The middle of the river was their southern boundary, and their northern boundary was the Jabbok River, part of which formed the Ammonite border.
But we did not go near the territory of the Ammonites or to the banks of the Jabbok River or to the towns of the hill country or to any other place where the Lord our God had commanded us not to go.
But if any do not take care of their relatives, especially the members of their own family, they have denied the faith and are worse than an unbeliever.
One was Sihon, the Amorite king who ruled at Heshbon. His kingdom included half of Gilead: from Aroer (on the edge of the Arnon Valley) and from the city in the middle of that valley, as far as the Jabbok River, the border of Ammon;
The king of Ammon answered Jephthah's messengers, “When the Israelites came out of Egypt, they took away my land from the Arnon River to the Jabbok River and the Jordan River. Now you must give it back peacefully.”