'Works of the Law' in the Bible

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

This only would I learn from you. Received ye the Spirit by the works of the law, or by the hearing of faith?

He therefore that supplieth to you the Spirit, and worketh miracles among you, doeth he it by the works of the law, or by the hearing of faith?

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