Numbers 32:21

17But we ourselves will go ready armed before the children of Israel, until we have brought them unto their place: and our little ones shall dwell in the fenced cities because of the inhabitants of the land.

18We will not return unto our houses, until the children of Israel have inherited every man his inheritance.

19For we will not inherit with them on yonder side Jordan, or forward; because our inheritance is fallen to us on this side Jordan eastward.

20And Moses said unto them, If ye will do this thing, if ye will go armed before the Lord to war,

21And will go all of you armed over Jordan before the Lord, until he hath driven out his enemies from before him,

22And the land be subdued before the Lord: then afterward ye shall return, and be guiltless before the Lord, and before Israel; and this land shall be your possession before the Lord.

23But if ye will not do so, behold, ye have sinned against the Lord: and be sure your sin will find you out.

24Build you cities for your little ones, and folds for your sheep; and do that which hath proceeded out of your mouth.

25And the children of Gad and the children of Reuben spake unto Moses, saying, Thy servants will do as my lord commandeth.