'Works of the Law' in the Bible

knowing that a man is not justified by the works of the law, but by faith in Jesus Christ, even we have believed in Christ Jesus, that we might be justified by faith in Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.

This only would I learn of you, Did ye receive the Spirit by the works of the law, or by the hearing of faith?

He therefore that imparteth to you the Spirit, and worketh miracles among you, doth he it by the works of the law, or by the doctrine of faith?

For as many as are of the works of the law, are under the curse; for it is written, Cursed be every one that continueth not in all things which are written in the book of the law, to do them.