I have read from another end times scholar who says the Assyrian from Isaiah 14:25-27 is the same person as the man of sin in 2 Thessalonians 2:4, and that this is the person that stands in the temple and causes the abomination of desolation. He further states that there will be three people in the end, the Assyrian, the Anti-Christ, and the False Prophet. I have never heard this before and was quite surprised by it as I don’t see this when I study this out. Can you explain it?
Most scholars believe that the Assyrian spoken of in Isaiah 14:25 is Sennacherib, the King of Assyria who was defeated on Mt. Scopus outside of Jerusalem by a supernatural intervention of God. The fulfillment of Isaiah 14:25 came on the eve of Sennacherib’s planned attack on Jerusalem in 701 BC when the angel of the Lord swept through the Assyrian camp and slew 185,000 soldiers in a single night. The next morning the surviving Assyrians packed up and left (Isaiah 37:36-38). Isaiah began his ministry in 740BC and died in 681 so this would have happened during his lifetime.
Those who believe Isaiah 14:25 is meant for the end times see the Assyrian as a reference to the anti-Christ. Almost everyone believes 2 Thes. 2:4 refers to the anti-Christ as well. I’m not familiar with the notion that the Assyrian is a third person in the end times.