Galatians 2: Only One Way To Be Justified.

 16) We know that a person is not justified by the works of the law, but by faith in Jesus Christ. So we, too, have put our faith in Christ Jesus that we may be justified by faith in Christ and not by the works of the law, because by the works of the law no one will be justified.

Bible Gateway passage: Galatians 2 - New International Version Paul Accepted by the Apostles - Then after fourteen years, I went up again to Jerusalem, this time with Barnabas...