[Jas 2:20-26 NASB] (20) But are you willing to recognize, you foolish fellow, that faith without works is useless? (21) Was not Abraham our father justified by works when he offered up Isaac his son on the altar? (22) You see that faith was working with his works, and as a result of the works, faith was perfected; (23) and the Scripture was fulfilled [ἐπληρώθη] which says, "AND ABRAHAM BELIEVED GOD, AND IT WAS RECKONED TO HIM AS RIGHTEOUSNESS," and he was called the friend of God. (24) You see that a man is justified by works and not by faith alone. (25) In the same way, was not Rahab the harlot also justified by works when she received the messengers and sent them out by another way? (26) For just as the body without [the] spirit is dead, so also faith without works is dead.
Was Genesis 22:12 the fulfillment of the prophecy in Genesis 15:6?:
[Gen 15:6 YLT] (6) And he hath believed in Jehovah, and He reckoneth it to him -- righteousness. [Prophecy]
[Gen 22:12 NASB] (12) He said, "Do not stretch out your hand against the lad, and do nothing to him; for now I know that you fear God, since you have not withheld your son, your only son, from Me." [Fulfillment]
James seems to suggest that Genesis 15:6 was not "fulfilled" until Genesis 22:12. However, Paul seems to see it as being immediate:
[Rom 4:1-7, 9-12 NASB] (1) What then shall we say that Abraham, our forefather according to the flesh, has found? (2) For if Abraham was justified by works, he has something to boast about, but not before God. (3) For what does the Scripture say? "ABRAHAM BELIEVED GOD, AND IT WAS CREDITED TO HIM AS RIGHTEOUSNESS." (4) Now to the one who works, his wage is not credited as a favor, but as what is due. (5) But to the one who does not work, but believes in Him who justifies the ungodly, his faith is credited as righteousness, (6) just as David also speaks of the blessing on the man to whom God credits righteousness apart from works: (7) "BLESSED ARE THOSE WHOSE LAWLESS DEEDS HAVE BEEN FORGIVEN, AND WHOSE SINS HAVE BEEN COVERED. ... (9) Is this blessing then on the circumcised, or on the uncircumcised also? For we say, "FAITH WAS CREDITED TO ABRAHAM AS RIGHTEOUSNESS." (10) How then was it credited? While he was circumcised, or uncircumcised? Not while circumcised, but while uncircumcised; (11) and he received the sign of circumcision, a seal of the righteousness of the faith which he had while uncircumcised, so that he might be the father of all who believe without being circumcised, that righteousness might be credited to them, (12) and the father of circumcision to those who not only are of the circumcision, but who also follow in the steps of the faith of our father Abraham which he had while uncircumcised.
So who is right, James or Paul?!