Joshua 22:10-11

10And they came to the districts of the Jordan that are in the land of Canaan; and the children of Reuben and the children of Gad and the half tribe of Manasseh built there an altar by the Jordan, an altar of grand appearance.

11And 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 over against the land of Canaan, in the districts of the Jordan, separately from the children of Israel.