The Apostle Paul
Romans 8:4BSB·traditional attribution

so that the righteous standard of the law might be fulfilled in us, who do not walk according to the flesh but according to the Spirit.

William Burkitt Anglican

Our apostle here assigns another end and cause, for which God sent his Son into the world; namely, to do what the law commanded, as well as to suffer what the law threatened; perfectly to fulfil the righteousness of the law for us, which it was impossible for us to do for ourselves; for the sake of which we are accounted righteous in the sight of God. Learn hence, 1.

Geneva Bible Notes Reformed

That the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit. (l) The very substance of the law of God might be fulfilled, or that same which the law requires, that we may be found just before God: for if with our justification there is joined that sanctification which is imputed to us, we are...

John Calvin Reformed

4. That the justification of the law might be fulfilled, etc. They who understand that the renewed, by the Spirit of Christ, fulfil the law, introduce a gloss wholly alien to the meaning of Paul; for the faithful, while they sojourn in this world, never make such a proficiency, as that the justification of the law becomes in them full or complete.