Numbers 32:16-32

Conditions for possession of the land

16 So they approached him and said, "We will build walled enclosures here for our livestock and towns for our children.
17 Then we will eagerly fight in front of the Israelites until we have brought them into their place. Our children will live in the fortified cities because of the land's inhabitants.
18 And we won't return to our homes until each one of the Israelites takes possession of his property.
19 We won't inherit land with them there across the Jordan, because we've received our property on the east side of the Jordan."
20 Moses said to them, "Do this and fight before the LORD in war.
21 All of you who are equipped for war, cross the Jordan before the LORD until he has driven his enemies out before him
22 and the land is subdued in the LORD's presence. Then you may return innocently before the LORD and Israel, and this land will be your property before the LORD.
23 But if you don't do this, you've sinned against the LORD. Know that your sin will find you.
24 So build towns for your children and walled enclosures for your flocks, but do what you have promised."
25 The Gadites and the Reubenites said to Moses, "Your servants will do as my master has commanded.
26 Our children, wives, livestock, and all of our animals will remain in the cities of Gilead.
27 But your servants, everyone equipped for war before the LORD, will go over to do battle as my master said."
28 Moses made demands for them to Eleazar the priest, to Joshua, Nun's son, and to the leaders of the households of the Israelite tribes.
29 Moses said to them, "If the Gadites and the Reubenites cross the Jordan with you, each equipped for battle before the LORD, and the land is subdued before you, then you will give them the land of Gilead as a possession.
30 If, however, they don't cross with you, equipped for war, they will take possession of property with you in the land of Canaan."
31 The Gadites and the Reubenites answered, "We'll do just as the LORD has spoken to your servants.
32 We'll cross into the land of Canaan before the LORD, equipped for war. But the property we inherit will be across the Jordan."