Galatians 2:17-18

17But if, while we seek to be justified in Christ [by faith], we ourselves are found to be sinners, does that make Christ an advocate or promoter of our sin? Certainly not!

18For if I [or anyone else should] rebuild [through word or by practice] what I once tore down [the belief that observing the Law is essential for salvation], I prove myself to be a transgressor.