Deuteronomy 3:20

20 Let your families and livestock stay in those towns until the LORD gives peace and rest to the other tribes, just as he has given you peace and rest. And let them stay until the other tribes have taken over the land the LORD your God is giving them. That land is across the Jordan River. After that, each of you may go back to the land I've given you as your very own."

Deuteronomy 3:20 Meaning and Commentary

Deuteronomy 3:20

Until the Lord have given rest unto your brethren, as well as
unto you
Rest from their enemies, and habitations to dwell quietly in; so the land of Canaan is called a rest, ( Deuteronomy 12:9 ) typical of the rest which remains for the people of God:

and until they also possess the land which the Lord your God hath given
them beyond Jordan;
for so Canaan was with respect to Moses and the people with him, who were then in the plains of Moab; otherwise the country in which he was with respect to Canaan is usually called beyond Jordan; this the Lord had given in promise to Israel, and they were just now ready to enter into and possess it, by virtue of his gift, and which made it sure unto them:

and then shall ye return every man unto his possession, which I have
given you;
as accordingly they did, ( Joshua 22:1-34 ) .

Deuteronomy 3:20 In-Context

18 Here is the command I gave at that time to the tribes of Reuben and Gad and half of the tribe of Manasseh. I said, "The LORD your God has given you this land as your very own. But all of your strong men must be prepared for battle. They must cross over ahead of the rest of your fellow Israelites.

19 "But your wives and children can stay in the towns I've given you. You can keep your livestock there too. I know you have a lot of livestock.

20 Let your families and livestock stay in those towns until the LORD gives peace and rest to the other tribes, just as he has given you peace and rest. And let them stay until the other tribes have taken over the land the LORD your God is giving them. That land is across the Jordan River. After that, each of you may go back to the land I've given you as your very own."

21 At that time I gave Joshua a command. I said, "Your own eyes have seen everything the LORD your God has done to Sihon and Og. He will do the same thing to all of the kingdoms in the land where you are going.

22 Don't be afraid of them. The LORD your God himself will fight for you."