Matthew 5:17 Jesus said, “Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them
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“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
he explained this a little better after he rose up
“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 24:44-47 KJV
When he said until “all be fulfilled “ he was taking about all of the prophecy in the law and prophets about him needing to be fulfilled culminating in his death and resurrection and ascension to heaven
the whole gospel is in prophecy beforehand from Jesus virgin birth , all the way to his ascension into heaven after his resurrection and his seating at Gods right hand the whole story was told beforehand in the law and prophets , Jesus is the fulfillment of those things in the law and prophets that needed to come to pass for the new covenant to be given
the Old Testament law is still in the world , only baptized Christians have had it fulfilled for them by Jesus. His suffering and death fulfilled the law for sinners because it demands thoer death
when he did that died for the sins of them prior covenant everyone who is in him it’s as of the law has been fulfilled upon them and they died for thier sins under the law it’s why we’re baptized into his death that fulfills the law
and when someone dies , the law no longer has any authority over them and they can then “be married to another law “
“Know ye not, brethren, how that the law hath dominion over a man as long as he liveth?
For the woman which hath an husband is bound by the law to her husband so long as he liveth; but if the husband be dead, she is loosed from the law of her husband.
So then if, while her husband liveth, she be married to another man, she shall be called an adulteress: but if her husband be dead, she is free from that law; so that she is no adulteress, though she be married to another man.
Wherefore, my brethren, ye also are become dead to the law by the body of Christ; that ye should be married to another, even to him who is raised from the dead, that we should bring forth fruit unto God.”
Romans 7:1-4 KJV
The law isn’t gone from the world when a Christian is baptized they have died to the law and the law has no authority after they die , it’s fulfilled already and they belong to another covenant the new one the gospel