Numbers 32:16-19

16And they drew near to him, and said, We will build sheepfolds here for our cattle, and cities for our little ones;

17but we ourselves will go with diligence armed before the children of Israel, until we have brought them to their place; and our little ones shall dwell in the strong cities because of the inhabitants of the land.

18We will not return to our houses, until the children of Israel have inherited each one his inheritance.

19For we will not inherit with them on yonder side the Jordan, and further, because our inheritance is fallen to us on this side the Jordan eastward.