Numbers 32:16-27

16Then they came up to him and said, “We will build sheepfolds for our livestock and cities for our children.

17But we are prepared to arm ourselves and go ahead of Bnei-Yisrael until we have brought them to their place. Our children will live in the cities fortified against the inhabitants of the land.

18We will not return to our homes until each one of Bnei-Yisrael has received his inheritance.

19Yet we will not inherit with them on the side beyond the Jordan, since our inheritance has come on the east side of the Jordan.”

20Moses said to them, “If you will do this—if you will arm yourselves for battle for Adonai,

21and if all of you cross the Jordan until Adonai has driven His enemies from before Him

22and the land is subdued before Adonai—then afterward you may return and be free before Adonai and Israel. Then this territory will be your possession before Adonai.

23“But if you don’t do this, behold, you sin against Adonai! Be assured! Your sin will find you out!

24Build for yourselves cities for your children and pens for your flocks. Then do what has come out of your mouth.”

25The sons of Gad and Reuben said to Moses saying, “Your servants will do just as my lord is commanding.

26Our children, our wives, our flocks, and all of our herds will remain here in the cities of Gilead.

27But your servants, every one armed for battle, will cross over for the war before Adonai, just as my lord says.”