Numbers 32:22 (KJV)

But we ourselves will go ready armed before the children of Israel, until we have brought them unto their place: and our little ones shall dwell in the fenced cities because of the inhabitants of the land.

We will not return unto our houses, until the children of Israel have inherited every man his inheritance.

For we will not inherit with them on yonder side Jordan, or forward; because our inheritance is fallen to us on this side Jordan eastward.

And Moses said unto them, If ye will do this thing, if ye will go armed before the LORD to war,

And will go all of you armed over Jordan before the LORD, until he hath driven out his enemies from before him,

But if ye will not do so, behold, ye have sinned against the LORD: and be sure your sin will find you out.

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.