Numbers 32:23

20 Then Moses said to them, If you will do this, arming yourselves to go before the Lord to the war,

21 Every armed man of you going across Jordan before the Lord till he has overcome and sent in flight all who are against him,

22 And the land is under the rule of the Lord: then after that you may come back, having done no wrong to the Lord and to Israel; and this land will be yours for your heritage before the Lord.

23 But if you do not do this, then you are sinners against the Lord; and you may be certain that your sin will have its reward.

24 So get to work building your towns for your little ones, and safe places for your sheep; and do as you have said.

25 And the children of Gad and the children of Reuben said to Moses, Your servants will do as my lord says.

26 Our little ones, our wives, and our flocks, and all our cattle, will be there in the towns of Gilead;