Joshua 22:9-12 - Eastern Tribes Build An Altar
9 So the people of the tribes of Reuben, Gad, and Manasseh went back home. They left the rest of the people of Israel at Shiloh in the land of Canaan and started out for their own land, the land of Gilead, which they had taken as Jehovah commanded them through Moses. 10 The children of Reuben and Gad and the half tribe of Manassah built a large altar by the borders of Jordan in the land of Canaan.
11 The children of Israel heard that the half tribe of Manasseh built an altar in the land of Canaan on the side belonging to the sons of Israel, at the Jordan when they passed by. 12 When the people of Israel heard this, the whole community came together at Shiloh to go to war against the eastern tribes.