Deuteronomy 3:18-20

18“Then I commanded you at that time, saying: ‘The Lord your God has given you this land to possess. All you men of valor shall cross over armed before your brethren, the children of Israel.

19But your wives, your little ones, and your livestock (I know that you have much livestock) shall stay in your cities which I have given you,

20until the Lord has given rest to your brethren as to you, and they also possess the land which the Lord your God is giving them beyond the Jordan. Then each of you may return to his possession which I have given you.’