Sabbath is not mentioned in Acts 15.
Because they were addressing the Book of the Law not the Ten Commandments. The Decalogue was not the issue the Book of the Law was; and only parts of it.
It is never commanded anywhere in the new covenant. Comprehend?
Sure it is
Heb 4:9,10
So there remains a (sabattismos) Sabbath-keeping for the people of Elohim.
Footnote: The Greek word is sabattismos, means Sabbath-keeping.
For he that is entered into his rest [received the Gospel], he also hath ceased from his own works, as God did from His.
Because of receiving the Gospel we cease from our own works
as GOD did from His.
"As" is a direct comparison. So with that you must ask yourself how and when did God cease from his own works?
The answer to that is recorded in Gen 2.... on the Seventh Day, And God did rest from all His work on the seventh day (see Hebrews 4:4 and Genesis Chapter 2:1-3).
God Is a Spiritual Being he is always in the state of Spiritual Rest. HE did not enter into the Rest of the GOSPEL. On the Seventh Day the Sabbath he ceased from the physical labor of creation. And this is recorded in Genesis 2.
Therefore they that have received the Gospel Rest, cease from their own physical work as God did from His physical work on the 7th day Sabbath. And this is, was and will continue to be done on the Seventh day of the week.
It is mentioned in Colossians 2 with the explicit admonition, do NOT allow anyone to judge you over it. It is explicitly called a shadow of the reality found in Christ there.
The Context and Grammar prove that Colossians 2 is referring to the Book of the Law.
. Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:
(Col 2:16 KJV)
First the Word for Sabbath in Col 2:16 is plural.
Secondly Verse 16 starts with the word therefore. Which keeps it in context to what was previously stated. So let’s look at verse 14.
Col 2:14 in the King James version reads like this, “Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross”
The KJV did not do a good job translating that verse. It ignore the Greek definite article "tois".
The Greek says, "cheirographon (Handwriting)
tois (to the) dogmasin (ordinances)"
The definite article “tois” would translate to the English word "the" as shown above. Because the clause cheirographon (Handwriting)
tois (to the) dogmasin (ordinances) is in the dative case.
Robinson's morphological analyze grammatical codes states this on the Dative (indirect object, usually translated "to"; also location "in", "at"; instrument, "with")
So the phrase “handwriting of ordinances” being in the Dative case would dictate the use of the words "to, in, at or with" in it's translation.
So one can easily see it is the Handwriting to the ordinances and not the Handwriting of ordinances. "The Handwriting of the ordinances" would be the Handwriting that pertain to the ordinances and not the ordinances themselves.
The handwriting of ordinances could be misconstrued as to include the ordinances themselves. This is not the intent of the Author according to grammar.
If something is to something it is not the something it is separate. It is distinct from that in which it is of.
If something is to something it is not the same as that which it is to (part of) it is different.
"The Handwriting to the ordinances" would be the Handwriting that pertain to the ordinances. Not the ordinances themselves in Col 2:14.
The text says the "handwriting to the ordinances that were against us and contrary to us". These were those laws pertaining to when we sinned not those laws that showed us what righteousness is.
Paul is not addressing the Decalogue in Colossians. He is writing of the Book of the Law and only those writings in it that were against us and contrary to us. Those writings that dealt with when we sinned.
The Decalogue; the Ten Commandments are distinct from the Book of the Law. Deut. 31:26 covers both these points. It says, “
Take this book of the law, and put it in the side of the ark of the covenant of the LORD your God, that it may be there
for a witness against thee.
They are separate and Clearly only parts that dealt with when we sinned in Book of the Law is that which is a witness against us not the Decalogue.
The Decalogue and the statutes and commandments contained in the Book of the Law that show us what righteousness is are not against us they are for us. They are Life (Christ; the Word). Which is to be in our hearts. To be who we are; that is, the word of faith, which we preach. That is the GOSPEL!
For righteousness which is of faith speaketh on this wise, Say not in thine heart, Who shall ascend into heaven? (that is, to bring Christ ( the Word; GOD's commands and statutes written in the Book of the Law; the Divine utterances) down from above
Or, Who shall descend into the deep? (that is, to bring up Christ (the Word; GOD's commands and statutes written in the Book of the Law; the Divine utterances) again from the dead.)
But what saith it? The Word ( Christ the Divine utterances; GOD's commands and statutes written in the Book of the Law) is nigh thee, even in thy mouth, and in thy heart: (that thou mayest do it) that is, the word of faith, which we preach.
Verse 10:4
For Christ (The word; the Divine utterances; GOD's commands and statutes written in the Book of the Law in our hearts and in our mouth that we do it) is the end of the (written) law for righteousness to everyone that believeth. Written not with ink, but with the Spirit of the living God; not in tables of stone, but in fleshy tables of the heart. And such trust have we through Christ to God-ward: Not that we are sufficient of ourselves to think anything as of ourselves; but our sufficiency is of God; Who also hath made us able ministers of the new testament; not of the letter, but of the spirit: for the letter killeth, but the spirit giveth life.
(Rom10:6-8,4; 2Co 3:3-6)