But God himself canMen cannot abrogate God's Word.
Jesus Himself said, "For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled" Mt 5:18.
All has NOT been fulfilled. There is still Revelation of John that needs fulfilling as well as many prophecies in the Old Covenant.
And he established a new covenant
Sorry, but the New Testament is scripture. The old covenant has been abolished
And here is the New Testament affirmation
Ephesians 2:13–19 (NASB 2020) — 13 But now in Christ Jesus you who previously were far away have been brought near by the blood of Christ. 14 For He Himself is our peace, who made both groups into one and broke down the barrier of the dividing wall, 15 by abolishing in His flesh the hostility, which is the Law composed of commandments expressed in ordinances, so that in Himself He might make the two one new person, in this way establishing peace; 16 and that He might reconcile them both in one body to God through the cross, by it having put to death the hostility. 17 AND HE CAME AND PREACHED PEACE TO YOU WHO WERE FAR AWAY, AND PEACE TO THOSE WHO WERE NEAR; 18 for through Him we both have our access in one Spirit to the Father. 19 So then you are no longer strangers and foreigners, but you are fellow citizens with the saints, and are of God’s household,
and
Acts 15:13–17 (KJV 1900) — 13 And after they had held their peace, James answered, saying, Men and brethren, hearken unto me: 14 Simeon hath declared how God at the first did visit the Gentiles, to take out of them a people for his name. 15 And to this agree the words of the prophets; as it is written, 16 After this I will return, and will build again the tabernacle of David, which is fallen down; and I will build again the ruins thereof, and I will set it up: 17 That the residue of men might seek after the Lord, and all the Gentiles, upon whom my name is called, saith the Lord, who doeth all these things.