Romans 3:20
Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin.
Torrey's Topical Textbook—AKJV

Romans 7:7
What shall we say then? Is the law sin? God forbid. No, I had not known sin, but by the law: for I had not known lust, except the law had said, You shall not covet.
Torrey's Topical Textbook—AKJV