Once we become Christians the Mosaic laws have no hold on us we need not obey them. We are to obey the Law of Christ which are also the Moral laws. Christ fulfilled the ceremonial laws as they pointed to him.
Sacrifice of animals--->Sacrifice of Christ
Temple in Jerusalem--->Our bodies are the temple of the Holy Spirit
...and so on.
But Christ spoke what you call the Mosaic Law. That WAS His Law.
Sacrifice of animals--->Sacrifice of Christ
So is there a sacrifice for sin today? The animal sacrifices NEVER purged sin...
Heb 10:1 For the law having a shadow of good things to come, and not the very image of the things, can never with those sacrifices which they offered year by year continually make the comers thereunto perfect.
Heb 10:2 For then would they not have ceased to be offered? because that the worshippers once purged should have had no more conscience of sins.
Heb 10:3 But in those sacrifices there is a remembrance again made of sins every year.
Heb 10:4 For it is not possible that the blood of bulls and of goats should take away sins.
They were the schoolmaster that pointed to Christ as the ultimate sacrifice.
Temple in Jerusalem--->Our bodies are the temple of the Holy Spirit
OK, and? That is quite obvious. The point is sacrifice is not done away at all. If it is, then there is no sacrifice for sin and therefore no remission of sin...
Heb 9:19 For when Moses had spoken every precept to all the people according to the law, he took the blood of calves and of goats, with water, and scarlet wool, and hyssop, and sprinkled both the book, and all the people,
Heb 9:20 Saying, This is the blood of the testament which God hath enjoined unto you.
Heb 9:21 Moreover he sprinkled with blood both the tabernacle, and all the vessels of the ministry.
Heb 9:22 And almost all things are by the law purged with blood; and without shedding of blood is no remission.
Heb 9:23 It was therefore necessary that the patterns of things in the heavens should be purified with these; but the heavenly things themselves with better sacrifices than these.
This passage makes it very clear that the sprinkling of the blood of calves and goats was symbolic (again the schoolmaster to teach the lesson of the coming perfect sacrifice) of Christ's blood.
I have consistently stated this. Some of God's Law is fulfilled in Christ. We just saw that in the example above.
Some Laws are to practiced by us today. The Ten Commandments. Christ did not fulfill the sixth Commandment and make it unnecessary to keep it anymore did He? Or does it matter if you murder? (Christ says if you condemn your brother in your heart you are guilty.) He also said if you wish to enter into life, KEEP THE COMMANDMENTS.
Leaves us with the Temple Laws and the Levitical Laws. Are they done away? If one believes Christ...
Luk 16:17 And it is easier for heaven and earth to pass, than one tittle of the law to fail.
Then they are not. Can we keep them today? Is there a physical Temple today? No. Then those Laws cannot be practiced today. Here is a crude example (off the top of my head and not very refined)...
Should you stop at stop signs? Yes, always. Are they any stop signs on the interstate highways? No. Then do you stop on an interstate? No. If there were stop signs on the interstate, would you be required to stop? Yes. But there are none so you do not have to stop. Now substitute the Temple in the above example for interstates and the Temple Laws for stop signs.
Now if there was a Temple and a Levitical Priesthood operating on earth, should those Laws be obeyed? They are going to be in the Millenium! Ezek 40 through 48 makes this very clear. Why? I have wondered myself. Best understanding I can come to is that these people who live over into the Millenium will need a schoolmaster. Other than that, one has to wait and ask the Boss.