Jesus says something about not coming to abolish the laws of the OT, but to fulfill them.
"Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. 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" (Matthew 5:17-18).
Here Jesus didn't mean that he came to fulfill all of the commandments of the Mosaic law, for Jesus could not possibly have done that. For example, some applied only to women after childbirth (Leviticus 12:4-8) or to wives suspected of adultery by their husbands (Numbers 5:19-31). Instead, Jesus meant that he came to fulfill all of the prophecies regarding the Messiah (or Christ) in the Old Testament: "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 were written in the law of Moses, and in the prophets, and in the psalms, concerning me. Then opened he their understanding, that they might understand the scriptures, And said unto them, Thus it is written, and thus it behoved Christ to suffer, and to rise from the dead the third day: And that repentance and remission of sins should be preached in his name among all nations, beginning at Jerusalem" (Luke 24:44-48).
As the Messiah, the divine Son of God, Jesus had the authority to abolish the Old Mosaic law and replace it with the New Covenant: "For this is my blood of the new testament [the New Covenant], which is shed for many for the remission of sins" (Matthew 26:28). "Having abolished in his flesh the enmity, even the law of commandments" (Ephesians 2:15). "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" (Colossians 2:14).
"For there is verily a disannulling of the commandment going before for the weakness and unprofitableness thereof. For the law made nothing perfect, but the bringing in of a better hope did; by the which we draw nigh unto God" (Hebrews 7:18-19). "By so much was Jesus made a surety of a better testament" (Hebrews 7:22). "He is the mediator of a better covenant, which was established upon better promises. For if that first covenant [of the Mosaic law] had been faultless, then should no place have been sought for the second. For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah: Not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt" (Hebrews 8:6-8).
As the Messiah, the mediator of the New Covenant, Jesus had the authority to contradict the Old Covenant of the Mosaic law and replace it with his own, even better, New Covenant commandments: "Whosoever therefore shall break one of these least commandments [which Jesus is about to give in the Sermon on the Mount], 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. For I say unto you, That except your righteousness shall exceed the righteousness of the scribes and Pharisees [exceed the righteousness of the old Mosaic law], ye shall in no case enter into the kingdom of heaven ...
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It hath been said [in the Mosaic law], Whosoever shall put away his wife, let him give her a writing of divorcement: But I say unto you, That whosoever shall put away his wife, saving for the cause of fornication, causeth her to commit adultery: and whosoever shall marry her that is divorced committeth adultery.
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Again, ye have heard that it hath been said by them of old time [in the Mosaic law], Thou shalt not forswear thyself, but shalt perform unto the Lord thine oaths: But I say unto you, Swear not at all; neither by heaven; for it is God's throne: Nor by the earth; for it is his footstool: neither by Jerusalem; for it is the city of the great King. Neither shalt thou swear by thy head, because thou canst not make one hair white or black. But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
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Ye have heard that it hath been said [in the Mosaic law], An eye for an eye, and a tooth for a tooth: But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also" (Matthew 5:19,20,31-39).
"The Pharisees also came unto him, tempting him, and saying unto him, Is it lawful for a man to put away his wife for every cause? And he answered and said unto them, Have ye not read, that he which made them at the beginning made them male and female, And said, For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh? Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder.
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They say unto him, Why did Moses then command to give a writing of divorcement, and to put her away? He saith unto them, Moses because of the hardness of your hearts suffered you to put away your wives: but from the beginning it was not so. And I say unto you, Whosoever shall put away his wife, except it be for fornication, and shall marry another, committeth adultery: and whoso marrieth her which is put away doth commit adultery" (Matthew 19:3-9).
As the Messiah, Jesus had the authority to allow his disciples to break the Mosaic law: "At that time Jesus went on the sabbath day through the corn; and his disciples were an hungred, and began to pluck the ears of corn, and to eat. But when the Pharisees saw it, they said unto him, Behold, thy disciples do that which is not lawful to do upon the sabbath day. But he said unto them, Have ye not read what David did, when he was an hungred, and they that were with him; How he entered into the house of God, and did eat the shewbread, which was not lawful for him to eat, neither for them which were with him, but only for the priests? Or have ye not read in the law, how that on the sabbath days the priests in the temple profane the sabbath, and are blameless? But I say unto you, That in this place is one greater than the temple. But if ye had known what this meaneth, I will have mercy, and not sacrifice, ye would not have condemned the guiltless. For the Son of man is Lord even of the sabbath day" (Matthew 12:1-8).