Thematic Bible: Erect a monument to signify the unity of the tribes east of the jordan river with the tribes west of the river

And when they came unto the region about the Jordan, that is in the land of Canaan, the children of Reuben and the children of Gad and the half-tribe of Manasseh built there an altar by the Jordan, a great altar to look upon. And the children of Israel heard say, Behold, the children of Reuben and the children of Gad and the half-tribe of Manasseh have built an altar in the forefront of the land of Canaan, in the region about the Jordan, on the side that pertaineth to the children of Israel. And when the children of Israel heard of it, the whole congregation of the children of Israel gathered themselves together at Shiloh, to go up against them to war. read more.
And the children of Israel sent unto the children of Reuben, and to the children of Gad, and to the half-tribe of Manasseh, into the land of Gilead, Phinehas the son of Eleazar the priest, and with him ten princes, one prince of a fathers house for each of the tribes of Israel; and they were every one of them head of their fathers houses among the thousands of Israel.