Numbers 32:16-24

16Then they came very close to him and said, “We will build sheep folds here for our flocks and cities for our families,

17but we will maintain ourselves in armed readiness and go before the Israelites until whenever we have brought them to their place. Our descendants will be living in fortified towns as a protection against the inhabitants of the land.

18We will not return to our homes until every Israelite has his inheritance.

19For we will not accept any inheritance on the other side of the Jordan River and beyond, because our inheritance has come to us on this eastern side of the Jordan.”

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.”