Joshua 22:34

And Joshua gave a name to the altar of the children of Ruben, and the children of Gad, and the half tribe of Manasse; and said, It is a testimony in the midst of them, that the Lord is their God.

And the children of Reuben and the children of Gad called the altar Ed: for it shall be a witness between us that the Lord is God.

The children of Reuben and the children of Gad named the altar “A Witness Between Us that Yahweh is God.”