God didn’t ask us not to sin, but telling us not to.

But if you do, Jesus has already taken care of your sins.

I John 2:1-2 (KJV) – my little children, these things write I unto you, that ye sin not. And if any man sin, we have an advocate with the Father, Jesus Christ the righteous: and he is the propitiation for our sins and not for ours only, but also for the sins of the whole world.