Numbers 32:25-29

Then the sons of Gad and the sons of Reuben spoke to Moses, saying, “Your servants will do just as my lord commands.

Our little ones, our wives, our livestock, and all our cattle shall remain there in the cities of Gilead,

while your servants, that is, everyone who is armed for war, cross over in the presence of the Lord to battle, just as my lord says.”

So Moses gave the command regarding them to Eleazar the priest, to Joshua the son of Nun, and to the heads of the fathers’ households of the tribes of the sons of Israel.

And Moses said to them, “If the sons of Gad and the sons of Reuben, everyone who is armed for battle, cross with you over the Jordan in the presence of the Lord, and the land is subdued before you, then you shall give them the land of Gilead as their property;