Jde 1:17
But, beloved, remember ye the words which were spoken before of the apostles of our Lord Jesus Christ; How that they told you there should be mockers in the last time,
And so, we see them that mock the words of the apostles, as
not being the words of our Lord Jesus. They diminish Col 2 as only what Paul only says for himself,
not what Jesus the risen Son says to His NT churches on earth.
Tit 3:10
A man that is an heretick after the first and second admonition reject; Knowing that he that is such is subverted, and sinneth, being condemned of himself.
It's very heretical to dismiss any NT Scriptures of Christ, in order to limit His churches to OT law of Moses.
The old covenant law was given by Christ to natural Israel in Exodus, and ended with His crucifixion in the gospels. Jesus Christ the man born of a Jewish virgin was under the law of Moses, beginning with circumcision on the 8th day, and continuing with the law of Sabbath until His death on a cross.
The NT Scriptures now give the law and doctrine of Christ for His churches on earth. The risen Christ's dismissal of judging a special sabbath holyday observed as by law, is in Col 2.
No apostle of Jesus Christ ever commands a sabbath holyday. Nor do they ever write of any Sabbath among the commandments of the Lord, that He gave to His apostles for His NT churches to faithfully keep.
Act 1:1
The former treatise have I made, O Theophilus, of all that Jesus began both to do and teach, Until the day in which he was taken up, after that he through the Holy Ghost had given commandments unto the apostles whom he had chosen:
1Co 14:37
If any man think himself to be a prophet, or spiritual, let him acknowledge that the things that I write unto you are the commandments of the Lord.
2Pe 3:2
That ye may be mindful of the words which were spoken before by the holy prophets, and of the commandment of us the apostles of the Lord and Saviour:
9 of the old 10 commandments of the law of Moses, are given again for NT churches to obey. The old 4th is not spoken of as a NT commandment of the Lord.