DouglasKC: The Levitical priesthood is changed. Animal sacrifices are changed.
What you have failed to address is how one goes about keeping the old covenant feast days without all the cultic trappings of the old covenant, in particular the animal sacrifices and the levitical priesthood.
There is no instruction on how to keep Rosh Hashanah in a fashion pleasing to God without animal sacrifices, a levitical priesthood and a temple in which to bring the sacrifice before God. You need to invent an extra-biblical tradition just as the apostate Jewish rabbis have invented a tradition to celebrate these days without all the physical trappings outlined in the Mosaic ceremonial code.
Hebrews doesn't just say that the sacrifices and priesthood have changed. It says they are are decayed and were passing away in the first century along with the rest of the old covenant ceremonial laws.
"Then indeed, even the first covenant had ordinances of divine service and the earthly sanctuary. For a tabernacle was prepared: ..." (Heb. 9:1,2)
"For the law, having a shadow of the good things to come, and not the very image of the things, can never with these same sacrifices, which they offer continually year by year, make those who approach perfect. For then would they not have ceased to be offered? For the worshipers, once purified, would have had no more consciousness of sins. But in those sacrifices there is a reminder of sins every year. For it is not possible that the blood of bulls and goats could take away sins." (Heb. 10:1-4)
Unlike the animals that could not take away sin, that is precisely what Jesus same to do, to take away our sin.
Those who continue to follow after the old covenant ordinances are fundamentally denying what Hebrews says about the effectiveness of the sacrifice of Christ once for all. You are living under the shadow rather then according to the substance.
DouglasKC: BTW, do you celebrate Christmas and Easter? If so, wny? If not, why not?
Christmas and Easter and just as inappropriate for the new covenant as Rosh Hashanah and Yom Kippur. All of these feast days are a denial of the simplicity of new covenant worship as given to us in the Bible. Both sets are based on the traditions of men; one group is Roman syncretistic traditionalists and the other is Judaizing traditionalists who have not quite made it all the way into the freedom of the new covenant.
Are you looking for instruction? If you don't know how to celebrate the days that God ordained then I suggest that you do some research on how various Christians observe them.
There is no instruction on how to keep Rosh Hashanah in a fashion pleasing to God without animal sacrifices, a levitical priesthood and a temple in which to bring the sacrifice before God.
There is plenty of instruction. God tells us exactly when to celebrate the feast of trumpets:
Lev 23:24 Speak unto the children of Israel, saying, In the seventh month, in the first day of the month, shall ye have a sabbath, a memorial of blowing of trumpets, a holy convocation.
He tells us it is a memorial of "blowing of trumpets":
Lev 23:24 Speak unto the children of Israel, saying, In the seventh month, in the first day of the month, shall ye have a sabbath, a memorial of blowing of trumpets, a holy convocation.
He tells us that those who worship Him should gather together on that day:
Lev 23:24 Speak unto the children of Israel, saying, In the seventh month, in the first day of the month, shall ye have a sabbath, a memorial of blowing of trumpets,a holy convocation.
He tells us that we are to do no servile work on that day:
Lev 23:25 Ye shall do no servile work therein: but ye shall offer an offering made by fire unto the LORD.
Now we've already discussed the fact that the church of the Lord, our messiah, Jesus Christ, in the book of Hebrews, tells us that the sacrifice of Christ is now sufficient for offerings. What is pleasing to God is that people honor the days he created. He created them for a reason, for our benefit..and that is pleasing to God.
You need to invent an extra-biblical tradition just as the apostate Jewish rabbis have invented a tradition to celebrate these days without all the physical trappings outlined in the Mosaic ceremonial code.
What exactly are you saying I invented? The day? Not working? Blowing a trumpet? What?
Hebrews doesn't just say that the sacrifices and priesthood have changed. It says they are are decayed and were passing away in the first century along with the rest of the old covenant ceremonial laws.
Here again is where you make a major leap and insert topcat54 doctrine into the doctrine of God. The priesthood, according to the word of God, is CHANGED, not done away with:
Heb 7:11 If therefore perfection were by the Levitical priesthood, (for under it the people received the law,) what further need was there that another priest should rise after the order of Melchizedek, and not be called after the order of Aaron?
Heb 7:12 For the priesthood being changed, there is made of necessity a change also of the law.
Jesus Christ is now our high priest AND our sacrifice. Therefore, Levitical priesthood functions under the new covenant ARE changed. The creation AND observance of the feast days of the Lord were NOT functions of the priesthood. They were, and are, created through Jesus Christ himself and ARE his feast days:
Lev 23:2 Speak unto the children of Israel, and say unto them, Concerning the feasts of the LORD, which ye shall proclaim to be holy convocations, even these are my feasts.
This is the major stumbling block to your understanding. You can't resist the urge to "do away" with the things that Hebrews doesn't do away with. You invent your own idea of what the "old covenant" is versus the "new covenant" and then proceed to build your theology upon it.