Numbers 32:20-23

20And Moses said to them, If ye will do this thing, if ye will go armed before the LORD to war, 21And will go all of you armed over Jordan before the LORD, until he hath driven out his enemies from before him, 22And the land shall be subdued before the LORD: then afterward ye shall return, and be guiltless before the LORD, and before Israel; and this land shall be your possession before the LORD. 23But if ye will not do so, behold, ye have sinned against the LORD: and be sure your sin will find you out.