23 “But if you fail to do this, you will be sinning against the LORD; and you may be sure that your sin will find you out.

Read Numbers 32:23 Using Other Translations

But if ye will not do so, behold, ye have sinned against the LORD: and be sure your sin will find you out.
But if you will not do so, behold, you have sinned against the LORD, and be sure your sin will find you out.
But if you fail to keep your word, then you will have sinned against the LORD, and you may be sure that your sin will find you out.