Numbers 32:20-23 New King James Version (NKJV)

²⁰ Then Moses said to them: “If you do this thing, if you arm yourselves before the Lord for the war, ²¹ and all your armed men cross over the Jordan before the Lord until He has driven out His enemies from before Him, ²² and the land is subdued before the Lord, then afterward you may return and be blameless before the Lord and before Israel; and this land shall be your possession before the Lord. ²³ But if you do not do so, then take note, you have sinned against the Lord; and be sure your sin will find you out.