In (Matthew 5:17), Jesus made the statement Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. He came not to destroy the law, or the prophets, but to fulfill. Based on that statement many ministers have taught their congregation that the arrival of Jesus did away with the Old Testament along with its laws, statutes and Judgements. They even make the statement, to their congregation, that they are no longer under the Old Testament, but now operate under the New. So you have people believing that the Old Testament is no longer relevant today. One needs only to further examine the scriptures to find out, how incorrect that position is.
In (Matthew 5:18), Jesus Himself states 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. Now you will find in a concordance that jot and tittle mean letter. Here Jesus clearly states that not one letter of the law will be changed as long as heaven and earth exist. We know that the law came from the Old Testament so based solely on (Matthew 5:18), it nor the Old Testament can not be done away with.
There is clearly a discrepancy between what is being taught and what the scriptures say. The fact, that Jesus came to fulfill is known, because that is what is stated in (Matthew 5:17). But one needs to find out what He was to fulfill, since that is the condition put forth in (Matthew 5:18), when He said no letter would pass from the law until all is fulfilled. You will see the information needed to answer this will be found in the Old Testament. This itself serves as further proof as to how erroneous the position of doing away with the Old Testament is. Let's focus on what Jesus was referring to when He said He came not to destroy the law, but to fulfill and His position on the commandments.
The Gospel of Luke, will reveal what Jesus meant when He said in (Matthew 5:17 & 18), that He came to fulfill and no letter would pass from the law until all is fulfilled. Looking at Luke chapter 24:14-44, you will find that , this is when Jesus had been crucified and Peter and others were at the grave site and they were contemplating the events that had occurred. Verse 16, tells you that Jesus had come among them but they did not know Him. In verse 17, Jesus asks them what were they discussing,
(17) And he said unto them, What manner of communications are these that ye have one to another, as ye walk, and are sad?
In verse 19 and 20, they explained to Jesus what had taken place, still not recognizing Him. Verse 21, tells why they were sad, they had expected Jesus to restore Israel. (Israel as a nation , had a history of being conquered by other nations. They had been split into two kingdoms and the northern kingdom had already been taken into captivity prior to this time. All that remained was Judah, and now it had been taken over by Rome.) Now this was the 3rd day since Jesus crucifixion and they were in question because to them nothing had changed. Israel still remained in its same state. Note what Jesus says to them in verse 25:
(25) Then he said unto them, O fool, and slow of heart to believe all that the prophets have spoken:
Now the prophets had spoke of many things that Jesus was to do when He came. However they were just focused on the redemption of Israel. That is why Jesus told them in verse 25 that they were not bringing into remembrance all the things that were spoken of Him by the prophets. He reminded them in verse 26 that He had to suffer first and then enter into glory. He then in verse 27 went over all that the scriptures had to say concerning Himself. Following is verse 27,
(27) And beginning at Moses and all the prophets, He expounded unto them in all the scriptures the things concerning Himself.
The following verse explains what Jesus meant in (Matthew 5:17) where He said He came not to destroy the law but to fulfill. Jesus says in (Luke 24:44) And He said unto them, These are the words which I spake unto you, while I was yet with you, that all things must be fulfilled, which are written in the law of Moses, and in the prophets, and in the psalms, concerning me.
Here Jesus makes it clear that all things written about Him in the Old Testament must be fulfilled. Knowing that all things must be fulfilled by Jesus, as long as heaven and earth is still here, tells us that the law (Commandments) are still here as well and must be kept.