Romans 3:20
Because no human creature can be brought into right standing with God by observing the law. For all the law can do is to make men conscious of sin.
Galatians 2:16
because we know that a man does not come into right standing with God by doing what the law commands, but by simple trust in Christ, we too have trusted in Christ Jesus, in order to come into right standing with God by simple trust in Christ and not by doing what the law commands, because by doing what the law commands no man can come into right standing with God.
1 John 1:10
If we claim "We have not sinned," we are making Him a liar, and His message is not in our hearts.