The same is true in the Old Testament brother!

Rom 4:2 For if Abraham were justified by works, he hath whereof to glory; but not before God.
Rom 4:3 For what saith the scripture? Abraham believed God, and it was counted unto him for righteousness.
Rom 4:4 Now to him that worketh is the reward not reckoned of grace, but of debt.
Rom 4:5 But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness.
Rom 4:6 Even as David also describeth the blessedness of the man, unto whom God imputeth righteousness without works,

Gal 2:16 Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.

We don't need a man who rejects the very words of the Lord Jesus Christ to "interpret" it for us. Just believe it.