But if you do not do what you have said, no one could doubt that you will have sinned against God. And know this: your sin shall overtake you
Other versions
King James Version
But if ye will not do so, behold, ye have sinned against the LORD: and be sure your sin will find you out.English Standard Version
But if you will not do so, behold, you have sinned against the LORD, and be sure your sin will find you out.New International Version
"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.