And his feet shall stand in that day upon the mount of Olives, which is before Jerusalem on the east, and the mount of Olives shall cleave in the midst thereof toward the east and toward the west, and there shall be a very great valley; and half of the mountain shall remove toward the north, and half of it toward the south. And his feet shall stand - He shall appear in full possession of the place, as a mighty conqueror.
And the mount of Olives shall cleave - God shall display his miraculous power as fully in the final restoration of the Jews, as he did when he divided the Red Sea that their forefathers might pass through dry-shod. Some refer this to the destruction of the city by the Romans. It was on the mount of Olives that Titus posted his army to batter Jerusalem. Here the tenth legion that came to him from Jericho was placed. Joseph. De Bello, lib. 6 c. 3. It was from this mountain that our Lord beheld Jerusalem, and predicted its future destruction, Luke 19:41, with Matthew 24:23; and it was from this mountain that he ascended to heaven, (Acts 1:12), utterly leaving an ungrateful and condemned city.
And half of the mountain shall remove - I really think that these words refer to the lines of circumvallation, to intrenchments, redoubts, etc., which the Romans made while carrying on the siege of this city; and particularly the lines or trenches which the army made on Mount Olivet itself.