Matthew 24:16

And this we know was so done when the fall of Jerusalem drew near; for on the approach of the Roman army, all the Christians in the province, warned, as ecclesiastical history tells us (Euseb. H.E. iii. 5.), miraculously from heaven, withdrew, and passing the Jordan, took refuge in the city of Pella; and under the protection of that King Agrippa, of whom we read in the Acts of the Apostles, they continued some time; but Agrippa himself, with the Jews whom he governed, was subjected to the dominion of the Romans.

Having spoken of the ills that were to overtake the city, and of the trials of the apostles, and that they should remain unsubdued, and should overrun the whole world, He mentions again the Jews' calamities, showing that when the one should be glorious, having taught the whole world, the others should be in calamity. And see how He relates the war, by the things that seem to be small setting forth how intolerable it was to be. For, "Then," saith He, "let them which be in Judaea flee into the mountains." Then, When? When these things should be, "when the abomination of desolation should stand in the holy place." Whence be seems to me to be speaking of the armies. Flee therefore then, saith He, for thenceforth there is no hope of safety for you. For since it had fallen out, that they often had recovered themselves in grievous wars, as under Sennacherib, under Antiochus again (for when at that time also, armies had come in upon them, and the temple had been seized beforehand, the Maccabees rallying gave their affairs an opposite turn); in order then that they might not now also suspect this, that there would be any such change, He forbids them all thought of the kind. For it were well, saith He, to escape henceforth with one's naked body.

(Verse 16 onwards) Then those who are in Judea, let them flee to the mountains; and those who are on the roof, let them not come down to take anything from their house; and those who are in the field, let them not turn back to take their cloak. The abomination of desolation can be understood, and every perverse teaching; when we see it standing in the holy place, that is, in the Church, and proclaiming itself as God, we must flee from Judea to the mountains, that is, leaving behind the letter of the law and Jewish corruption, and approach the eternal mountains, from which God wonderfully enlightens (Psalm 75); and be on the roof and in the inner room, where the fiery darts of the devil cannot reach: neither coming down and taking anything from the former way of life: nor turning back are they to seek; but rather to sow in the field of spiritual Scriptures, so that we may bear fruit from it. Neither to take off the other tunic, which the apostles are forbidden to have. On this subject, that is, on the abomination of desolation, which was spoken of by the prophet Daniel, Porphyry blasphemed against us in the thirteenth volume of his work, while standing in a holy place. To him, Eusebius of Caesarea, the bishop, responded in three volumes: the eighteenth, nineteenth, and twentieth. Apollinaris ((also known as Apollinarius)) also wrote extensively, and attempted to discuss in one chapter what has been disputed in so many thousands of verses.