James 2:23

scripture was fulfilled-- Gen 15:6, quoted by Paul, as realized in Abraham's justification by faith; but by James, as realized subsequently in Abraham's work of offering Isaac, which, he says, justified him. Plainly, then, James must mean by works the same thing as Paul means by faith, only that he speaks of faith at its manifested development, whereas Paul speaks of it in its germ. Abraham's offering of Isaac was not a mere act of obedience, but an act of faith. Isaac was the subject of the promises of God, that in him Abraham's seed should be called. The same God calls on Abraham to slay the subject of His own promise, when as yet there was no seed in whom those predictions could be realized. Hence James' saying that Abraham was justified by such a work, is equivalent to saying, as Paul does, that he was justified by faith itself; for it was in fact faith expressed in action, as in other cases saving faith is expressed in words. So Paul states as the mean of salvation faith expressed. The "Scripture" would not be "fulfilled," as James says it was, but contradicted by any interpretation which makes man's works justify him before God: for that Scripture makes no mention of works at all, but says that Abraham's belief was counted to him for righteousness.

— Jamieson-Fausset-Brown Commentary (public domain)