Malachi
Chapter 3
1 Behold, I will send my messenger, and he shall prepare the way before me: and the Lord, whom ye seek, shall suddenly come to his temple, even the messenger of the covenant, whom ye delight in: behold, he shall come, saith the LORD of hosts.
2 But who may abide the day of his coming? and who shall stand when he appeareth? for he is like a refiner’s fire, and like fullers’ soap:
3 And he shall sit as a refiner and purifier of silver: and he shall purify the sons of Levi, and purge them as gold and silver, that they may offer unto the LORD an offering in righteousness.
4 Then shall the offering of Judah and Jerusalem be pleasant unto the LORD, as in the days of old, and as in former years.
5 And I will come near to you to judgment; and I will be a swift witness against the sorcerers, and against the adulterers, and against false swearers, and against those that oppress the hireling in his wages, the widow, and the fatherless, and that turn aside the stranger from his right, and fear not me, saith the LORD of hosts.
6 For I am the LORD, I change not; therefore ye sons of Jacob are not consumed.
It is long and it is late - but I did skim a bit of it.
Hebrews 6, 4 - 6 indicate that when circumstances result in pushing Christ to be crucified again - since they are crucifying once again the Son of God to their own harm and holding him up to contempt.
I believe that, while this seems to indicate the dilemma of a repentant back slider, that it can be broadened to include those who heard the Gospel but rejected it... by reinstituting the sacrifice they are asking Messiah to once again be crucified for them, thus holding Him up to contempt. Christ says that the one sin that cannot be forgiven is blaspheming the Holy Ghost. Since Christ is revealed by the Holy Spirit, and the Gospel was preached to the Jew, reinstituting the sacrifice is contemptuous, an abomination - which leads to desolation.
I have known a number of Jews that have received that revelation and the joy and power of the experience is incredible! Suddenly passages of Scripture and parts of festival traditions take on all new meaning - joyful revelation. No carnal sacrifice was needed, could only have hindered.