Dear John--
Of Matt.5:17, Jesus was speaking of Himself--"think not that I am come to destroy the law---I am not come to destroy but to fulfill--." Is there a difference between destroying something and fulfilling it? Certainly there is and further, I know you know there is. If one keeps an appointment one has not destroyed it, he has fulfilled it, and if not why not? Can you name ONE thing of the law (Moses) Jesus did not fulfill? Name one. Jesus said He "came" and He has went. Tell us, did Jesus do what He said He would do when He came?
And, why haven't you answered what I last wrote on Heb.4?
Christ plainly shows by the context of Mat 5 that the law is made complete or filled up, not finished...
G4137
πληρόω
plēroō
play-ro'-o
From G4134; to make replete, that is, (literally) to cram (a net), level up (a hollow), or (figuratively) to furnish (or imbue, diffuse, influence), satisfy, execute (an office), finish (a period or task), verify (or coincide with a prediction), etc.: - accomplish, X after, (be) complete, end, expire, fill (up), fulfil, (be, make) full (come), fully preach, perfect, supply.
If the law were finished then what means this...
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.
Then He goes on showing how the law is filled up...
Mat 5:21 Ye have heard that it was said by them of old time, Thou shalt not kill; and whosoever shall kill shall be in danger of the judgment:
Mat 5:22 But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire.
Mat 5:23 Therefore if thou bring thy gift to the altar, and there rememberest that thy brother hath ought against thee;
Mat 5:24 Leave there thy gift before the altar, and go thy way; first be reconciled to thy brother, and then come and offer thy gift.
Mat 5:27 Ye have heard that it was said by them of old time, Thou shalt not commit adultery:
Mat 5:28 But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.
Mat 5:33 Again, ye have heard that it hath been said by them of old time, Thou shalt not forswear thyself, but shalt perform unto the Lord thine oaths:
Mat 5:34 But I say unto you, Swear not at all; neither by heaven; for it is God's throne:
Mat 5:35 Nor by the earth; for it is his footstool: neither by Jerusalem; for it is the city of the great King.
Mat 5:36 Neither shalt thou swear by thy head, because thou canst not make one hair white or black.
Mat 5:37 But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
and this teaching of the magnification of the law continues through chapter 7.
I did address what you wrote about Heb 4 already, you will find that in #396...
katapausis or a variant is used in most places in Hebrews 4, but in verse 9, the word is Sabbatismos. Again, same principle as Mat 5, keeping the weekly and annual Sabbaths shows the meaning to be the coming rest which is the Millenial reign of Jesus Christ on the earth. At which time the Holydays, the Sabbath and New Moons will be observed...
Zec 14:16 And it shall come to pass, that every one that is left of all the nations which came against Jerusalem shall even go up from year to year to worship the King, the LORD of hosts, and to keep the feast of tabernacles.
Zec 14:17 And it shall be, that whoso will not come up of all the families of the earth unto Jerusalem to worship the King, the LORD of hosts, even upon them shall be no rain.
Zec 14:18 And if the family of Egypt go not up, and come not, that have no rain; there shall be the plague, wherewith the LORD will smite the heathen that come not up to keep the feast of tabernacles.
Zec 14:19 This shall be the punishment of Egypt, and the punishment of all nations that come not up to keep the feast of tabernacles.
Isa 66:23 And it shall come to pass, that from one new moon to another, and from one sabbath to another, shall all flesh come to worship before me, saith the LORD.
Not one tribe (Judah, the Jews) of the twelve tribes of Israel, but ALL FLESH, Israel and Gentiles alike.