TSK · Numbers 32:17

Moses said to them, "If the children of Gad and the children of Reuben will pass with you over the Jordan, every man who is armed to battle, before Yahweh, and the land shall be subdued before you; then you shall give them the land of Gilead for a possession:

The children of Reuben, and the children of Gad, and the half-tribe of Manasseh, passed over armed before the children of Israel, as Moses spoke to them.