Mat 5:17-18 "Do not think that I came to destroy the Law or the Prophets. I did not come to destroy but to fulfill. For assuredly, I say to you, till heaven and earth pass away, one jot or one tittle will by no means pass from the law till all is fulfilled."
Our Lord Jesus will fulfill all the Law and Prophets before the end of the present heaven and earth.
With Jesus as the Priesthood of Melchizedek, God had annulled all former commandments and making them obsolete.
Warning -Since God made the Law and Prophets obsolete, then Christians under the new covenant must not follow them.
Heb 7:12,18 For the priesthood being changed, of necessity there is also a change of the law... For on the one hand there is an annulling of the former commandment because of its weakness and unprofitableness.
Old Covenant is now Obsolete
Mat 26:27-28 Then He took the cup, and gave thanks, and gave it to them, saying, "Drink from it, all of you. For this is My blood of the new covenant, which is shed for many for the remission of sins."
The New Covenant started when our Lord Jesus died on the cross. Immediately, the veil in the temple of God was torn into two, signifying the departure of God from the Most Holy Place thus ending the Old Covenant
Heb 8:13 In that He says, "A new covenant," He has made the first obsolete. Now what is becoming obsolete and growing old is ready to vanish away.
Mat 20:19 "and deliver Him to the Gentiles to mock and to scourge and to crucify. And the third day He will rise again."
The Law and Prophets were fulfilled by Jesus' dead and resurrection except for the seventh month feast.
Burdensome Law of Moses
Act 15:5, 8-10 But some of the sect of the Pharisees who believed rose up, saying, "It is necessary to circumcise them, and to command them to keep the law of Moses"
The Apostles abolished the Law of Moses (sacrifices, Jewish feasts, commandments, etc.), which were burdensome to the Jews, for they were without the Holy Spirit of truth.
Act 15:8-10 "So God, who knows the heart, acknowledged them by giving them the Holy Spirit, just as He did to us, and made no distinction between us and them, purifying their hearts by faith. Now therefore, why do you test God by putting a yoke on the neck of the disciples which neither our fathers nor we were able to bear?"
Between OT and NT Covenants
1. OT - hate your enemy,
but NT - love your enemy.
2. OT - Tithe (10%) belongs to God,
but NT - All our wealth belongs to God for we are only His stewards.
3. OT - for material blessings,
but NT - for spiritual blessings.
Why God abolished Moses' Law
Gen 6:5 Then the LORD saw that the wickedness of man was great in the earth, and that every intent of the thoughts of his heart was only evil continually.
Our Lord knew that the hearts of men are always evil. They will always look for loopholes and excuses not to give nor sacrifice. So God abolished Moses' Law and disallows Christians from keeping them.
John 2:24-34 But Jesus did not commit Himself to them, because He knew all men, and had no need that anyone should testify of man, for He knew what was in man.
Heb 5:8-10 "though He was a Son, yet He learned obedience by the things which He suffered. And having been perfected, He became the author of eternal salvation to all who obey Him, called by God as High Priest "according to the order of Melchizedek,"
Brethren, we only need to obey His words to fulfill the Law.