I'm not sure where you're going with this, but please explain more. Do you mean that Matthew 5:48 "Be perfect, therefore, as your heavenly Father is perfect" does not agree with what I wrote above?
It doesn't disagree with what you wrote. What I'm looking at is the difference between a faith-based approach to salvation and a theologicial approach, particularly regarding the ideals of justice and perfection which are present in the sermon on the mount.
Every Christian probably finds the sermon on the mount beautiful and challenging, too. The blood of Christ washes away all the sins of all those who prove to be among God's elect. Christ's work here is perfect, is it not?
There's a symbolic aspect to the blood of the last supper, which is represented by wine:
For this is my blood of the new testament(diatheke), which is shed for many for the remission of sins.
But I say unto you, I will not drink henceforth of this fruit of the vine, until that day when I drink it new with you in my Father's kingdom.
Matthew 26:26-27
Diatheke means covenant. The're also symbolism relating to the practice and consent of the people of the covenant:
And he took the book of the covenant, and read in the audience of the people: and they said, All that YHWH hath said will we do, and be obedient.
And Moses took the blood, and sprinkled
it on the people, and said, Behold the blood of the covenant, which YHWH hath made with you concerning all these words.
Exodus 24:7-8
The law of the old covenant relates to the law of the new covenant:
Behold, the days come, saith YHWH, that 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
that I took them by the hand to bring them out of the land of Egypt; which my covenant they brake, although I was an husband unto them, saith YHWH:
But this
shall be the covenant that I will make with the house of Israel; After those days, saith YHWH, I will put my law in their inward parts, and write it in their hearts; and will be their Elohim, and they shall be my people.
Jeremiah 31:31-33
I am not greatly familiar with comparisons of Jonah's experience with the death and Resurrection of Jesus. Someone with greater learning than I will have to comment here.
Here's the text that relates the sign of Jonah to the crucifixion, for which the law is not relevant:
Matthew 12
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38 | Then certain of the scribes and of the Pharisees answered, saying, Master, we would see a sign from thee. |
39 | But he answered and said unto them, An evil and adulterous generation seeketh after a sign; and there shall no sign be given to it, but the sign of the prophet Jonas: |
40 | For as Jonas was three days and three nights in the whale's belly; so shall the Son of man be three days and three nights in the heart of the earth. |
41 | The men of Nineveh shall rise in judgment with this generation, and shall condemn it: because they repented at the preaching of Jonas; and, behold, a greater than Jonas is here. |
42 | The queen of the south shall rise up in the judgment with this generation, and shall condemn it: for she came from the uttermost parts of the earth to hear the wisdom of Solomon; and, behold, a greater than Solomon is here. |
And here's the text that relates the sign of Jonah to repentance, for which the law is relevant:
Luke 11
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29 | And when the people were gathered thick together, he began to say, This is an evil generation: they seek a sign; and there shall no sign be given it, but the sign of Jonas the prophet. |
30 | For as Jonas was a sign unto the Ninevites, so shall also the Son of man be to this generation. |
31 | The queen of the south shall rise up in the judgment with the men of this generation, and condemn them: for she came from the utmost parts of the earth to hear the wisdom of Solomon; and, behold, a greater than Solomon is here. |
32 | The men of Nineve shall rise up in the judgment with this generation, and shall condemn it: for they repented at the preaching of Jonas; and, behold, a greater than Jonas is here. |
Jonah 3
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3 | So Jonah arose, and went unto Nineveh, according to the word of YHWH. Now Nineveh was an exceeding great city of three days' journey. |
4 | And Jonah began to enter into the city a day's journey, and he cried, and said, Yet forty days, and Nineveh shall be overthrown. |
5 | So the people of Nineveh believed Elohim, and proclaimed a fast, and put on sackcloth, from the greatest of them even to the least of them. |
10 | And Elohim saw their works, that they turned from their evil way; and Elohim repented of the evil, that he had said that he would do unto them; and he did it not. |