Daniel 9, the 69 shmitahs is a time-frame of the messiah's arrival in Jerusalem, and his being cutoff.
Which the messiah's arrival is in John 12:12-15 in Jerusalem, hailed as the King of Israel coming in the name of Lord - in the text.
Then a little further down in John 12:23-28, Jesus spoke that the time had come for his death (the messiah cutoff) which would be a few days later.
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The 70th shmitah is about the 7 years preceding Jesus's return, fulfilling everything in Daniel 9:24.
The problem with your theory, well one problem anyway, is Messiah is Cut off AFTER the 69 weeks had already ended... The Cutting off of Messiah is not an event that takes place within the 1st 69 weeks. The text is quite unambiguously clear on that fact..
Why are 70 weeks determined? To do these things:
1. to finish the transgression
2. to make an end of sins
3. to make reconciliation for iniquity
4. to bring in everlasting righteousness
5. to seal up the vision and prophecy
6. to anoint the most Holy
1.
Finish the Transgression.
Recall that to begin with, the Jews were in captivity for 490 years because of not honoring the Sabbath - they didn't give the land rest every seven years. The 70 years of capitivity in Babylon gave the land its rest. This is in
2 Chronicles 36- it's a whole lot of verses. Then God gives them another 490 years - maybe this time is their last chance.
2.
Make an End of Sins.
Though we still sin, our sins no longer have power to prevent us from salvation. Jesus, by fulfilling the Law, ended sins strength. Sin is now utterly powerless to prevent anyone from Salvation. In fact, ONLY sinners get saved.
3.
Make Reconciliation for Iniquity.
Only Jesus could do this. He came to make reconciliation for us.
4.
Bring in Everlasting Righteousness
Jesus Himself said that He fulfilled all righteousness.
5.
Seal up the Vision and Prophecy
Contrary to what most teach about this passage, "seal up" doesn't mean to hide it from men's understanding until the last days. From Strong's, seal is [2856] chatham: meaning to close up, make an end of, stop. So Jesus made the end of this vision and prophecy. It doesn't say "all visions and prophecies" for you naysayers. It says "the vision..."
6.
Anoint the Most Holy
Again, Jesus was anointed at His baptism in
Mark 1. He is the Most Holy.
Jesus' first coming and ministry on this earth, through to His death, burial and resurrection and subsequent 3.5 year ministry to the
Jews exclusively by the apostles, fulfilled the 70th week of Daniel completely.