Numbers 32:23

19 Yet we will not have an inheritance with them across the Jordan and beyond, because our inheritance has come to us on the east side of the Jordan.”

20 Moses replied, “If you will do this—if you will arm yourselves before the LORD for battle,

21 and if every one of your armed men crosses the Jordan before the LORD, until He has driven His enemies out before Him,

22 then when the land is subdued before the LORD, you may return and be free of obligation to the LORD and to Israel. And this land will belong to you as a possession before the LORD.

23 But if you do not do this, you will certainly sin against the LORD—and be assured that your sin will find you out.

24 Build cities for your little ones and folds for your flocks, but do what you have promised.”

25 The Gadites and Reubenites said to Moses, “Your servants will do just as our lord commands.

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

27 But your servants are equipped for war, and every man will cross over to the battle before the LORD, just as our lord says.”

Read all of Numbers 32