Numbers 32:29 in the King James Version
And Moses said unto them, If the children of Gad and the children of Reuben will pass with you over Jordan, every man armed to battle, before the LORD, and the land shall be subdued before you; then ye shall give them the land of Gilead for a possession:
Context
28 So Moses commanded concerning them to Eleazar the priest, and to Joshua the son of Nun, and to the heads of the fathers’ households of the tribes of the children of Israel.
29 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 the LORD, and the land is subdued before you, then you shall give them the land of Gilead for a possession;
30 but if they will not pass over with you armed, they shall have possessions among you in the land of Canaan.”