Numbers 32:20-27

20Then Moses replied, “If you will do this thing, and if you will arm yourselves for battle before the Lord,

21and if all your armed men cross the Jordan before the Lord until he drives out his enemies from his presence

22and the land is subdued before the Lord, then afterward you may return and be free of your obligation to the Lord and to Israel. This land will then be your possession in the Lord’s sight.

23“But if you do not do this, then look, you will have sinned against the Lord. And know that your sin will find you out.

24So build cities for your descendants and pens for your sheep, but do what you have said you would do.”

25So the Gadites and the Reubenites replied to Moses, “Your servants will do as my lord commands.

26Our children, our wives, our flocks, and all our livestock will be there in the cities of Gilead,

27but your servants will cross over, every man armed for war, to do battle in the Lord’s presence, just as my lord says.”