Numbers 32:24-28

Build you cities for your little ones, and folds for your sheep; and do that which hath proceeded out of your mouth.

And the children of Gad and the children of Reuben spake unto Moses, saying, Thy servants will do as my lord commandeth.

Our little ones, our wives, our flocks, and all our cattle, shall be there in the cities of Gilead:

But thy servants will pass over, every man armed for war, before the LORD to battle, as my lord saith.

So concerning them Moses commanded Eleazar the priest, and Joshua the son of Nun, and the chief fathers of the tribes of the children of Israel: