Lukas 21:20

by armies--encamped armies, that is, besieged: "the abomination of desolation" (meaning the Roman ensigns, as the symbols of an idolatrous, pagan, unclean power) "spoken of by Daniel the prophet" (Dan 9:27) "standing where it ought not" (Mar 13:14). "Whoso readeth [that prophecy] let him understand" (Mat 24:15). Then . . . flee, &c.--EUSEBIUS says the Christians fled to Pella, at the north extremity of Perea, being "prophetically directed"; perhaps by some prophetic intimation still more explicit than this, which still would be their chart.

Having given them an idea of the times for about thirty-eight years next ensuing, he here comes to show them what all those things would issue in at last, namely, the destruction of Jerusalem, and the utter dispersion of the Jewish nation, which would be a little day of judgment, a type and figure of Christ's second coming, which was not so fully spoken of here as in the parallel place (Mt. 24), yet glanced at; for the destruction of Jerusalem would be as it were the destruction of the world to those whose hearts were bound up in it. I. He tells them that they should see Jerusalem besieged, compassed with armies (Luk 21:20), the Roman armies; and, when they saw this, they might conclude that its desolation was nigh, for in this the siege would infallibly end, though it might be a long siege. Note, As in mercy, so in judgment, when God begins, he will make an end. II. He warns them, upon this signal given, to shift for their own safety (Luk 21:21): "Then let them that are in Judea quit the country and flee to the mountains; let them that are in the midst of it" (Of Jerusalem) "depart out, before the city be closely shut up, and" (as we say now) "before the trenches be opened; and let not them that are in the countries and villages about enter into the city, thinking to be safe there. Do you abandon a city and country which you see God has abandoned and given up to ruin. Come out of her, my people." III. He foretels the terrible havoc that should be made of the Jewish nation (Luk 21:22): Those are the days of vengeance so often spoken of by the Old Testament prophets, which would complete the ruin of that provoking people. All their predictions must now be fulfilled, and the blood of all the Old Testament martyrs must now be required. All things that are written must be f…

21:20-24 Jesus was describing the siege and destruction of Jerusalem that would take place in AD 70.