The problem with this area is what causes the debate is what you are talking about when it comes to the law. Some say just the 10 commandments, others say all the laws from the old testament, and others say none of them apply to us.
When it comes to this debate they forget or cancel out what Jesus said. Jesus never said they were done away with, He also made additions or amendments to some of them. He also as well as other scriptures from the new testament from Peter, Paul, John, and the others made it clear that some of the other laws outside the 10 commandments from the old testament no longer apply to Christians.
Christ said NONE have passed away...
Luk 16:17 And it is easier for heaven and earth to pass, than one tittle of the law to fail.
So if that is the case, how do we proceed?
A) There are Laws that are timeless and should be kept...
The Ten Commandments should be kept. It will never be acceptable to God to worship other God's, bow down to statues, take Hi s name in vain, violate His Sabbath, dishonor out parents (human and our Father), murder, commit adultery, steal, lie or lust.
B) There are Laws we cannot keep...
Those Laws that applied to the Priesthood, sacrifices, etc are still valid today but one cannot keep them.
Some have had the application changed, animal sacrifices for one. The sacrifice for sin is still valid and in effect today, the Sacrifice has changed. The animal sacirfices looked forward to Christ...
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.
This next verse is very important to understand the purpose of animal sacrifices...
Heb 10:4 For it is not possible that the blood of bulls and of goats should take away sins.
They were the schoolmaster to show us Christ.
I heard an excellent analogy...
We should always stop at stop signs.
Are there stop signs on an Interstate Highway? No.
Should we stop on an Interstate Highway? No.
When we get off of an Interstate Highway and come into a town or city, do we stop at stop signs? Yes.
Sometimes the stop sign law does not apply.
There are ceremonial Laws that do not apply today.
C) There is a third type of Law that applies...
Deu 22:8 When thou buildest a new house, then thou shalt make a battlement for thy roof, that thou bring not blood upon thine house, if any man fall from thence.
In that time, the roof of a house was living space. One was required to put a handrail around the roof to protect those on the roof from falling off. Any application for that today? We have a couple of decks on the back of our house. They have handrails around them to protect people from falling off. Is this a good Law? Should one obey it?
Deu 22:10 Thou shalt not plow with an ox and an ass together.
Paul even quoted this one...
2Co 6:14 Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?
Another example...
Lev 18:8 The nakedness of thy father's wife shalt thou not uncover: it is thy father's nakedness.
Paul seemed to think it should still be followed...
1Co 5:1 It is reported commonly that there is fornication among you, and such fornication as is not so much as named among the Gentiles, that one should have his father's wife.
1Co 5:2 And ye are puffed up, and have not rather mourned, that he that hath done this deed might be taken away from among you.
Christ didn't stutter when He said...
Mat 5:17 Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.
Mat 5:18 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.
Mat 5:19 Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.
He meant that His Law (He was the LORD who spoke these Laws) should be kept. He also shows us there is a N.T. aaplication to them (Mat 5, 6 and 7 show us there is a spiritual component).