Numbers 32:20-22

New International Version - UK

²⁰ Then Moses said to them, ‘If you will do this – if you will arm yourselves before the Lord for battle ²¹ and if all of you who are armed cross over 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 from your obligation to the Lord and to Israel. And this land will be your possession before the Lord.