Read Numbers 32:29 Using Other Translations
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:
And Moses said to them, "If the people of Gad and the people of Reuben, every man who is armed to battle before the LORD, will pass with you over the Jordan and the land shall be subdued before you, then you shall give them the land of Gilead for a possession.
He said, “The men of Gad and Reuben who are armed for battle must cross the Jordan with you to fight for the LORD . If they do, give them the land of Gilead as their property when the land is conquered.