(20-24) When ye shall see Jerusalem compassed with armies.--See Notes on Matthew 23:15-21; Mark 13:14-19. This is St. Luke's equivalent, possibly chosen as more intelligible for his Gentile readers, for "the abomination of desolation," which we find in St. Matthew and St. Mark. As far as it goes, it favours the view that he and others saw the "abomination" in the presence of the invading armies. On the other hand, it is possible, accepting, as we must accept, the thought of a substituted phrase, that we have one which, while it gives a partial explanation, fails to exhaust the meaning of the darker and more mysterious phrase. The occurrence of the word "desolation" in the latter clause of the verse, obviously favours the hypothesis now suggested.

Verses 20-24. - The true signs which his people are to be on the watch for. Verse 20. - And when ye shall see Jerusalem compassed with armies, then know that the desolation thereof is nigh. This is to be the sign that the end has come for temple, city, and people. Wars and rumors of wars, physical portents, famine and pestilence succeeding each other with a terrible persistence, all these will, in the forthcoming years, terrify and perplex men's minds, presages of something which seems impending. But his people are to bear in mind that these were not the immediate signs of the awful ruin he was foretelling. But when the holy city was invested, when hostile armies were encamped about her - then this would surely come to pass, and some of these very bystanders would behold it - then, and not till then, let his people take alarm. Let them at once and at all cost flee from temple and city, for there would be no deliverance, God had left his house, given up the chosen people. "Jerusalem shall be trodden down of the Gentiles" (ver. 24). It is probable that these solemn words of the Master, becoming, as they did, at a comparatively early date, the property of the Church, saved the Christian congregations in Palestine from the fate which overtook the Jewish nation in the last great war. Clearly warned by Jesus that the gathering of the Roman armies in the neighborhood of Jerusalem was the unmistakable sign of the end of the Jewish polity, the Christian congregations fled to Pella beyond Jordan. The Jews never ceased to the last trusting that deliverance from on high would be vouchsafed to the holy city and temple. The Christians were warned by the words of the Founder of their faith - words spoken nigh forty years before the siege - that the time of mercy was hopelessly past.

21:5-28 With much curiosity those about Christ ask as to the time when the great desolation should be. He answers with clearness and fulness, as far as was necessary to teach them their duty; for all knowledge is desirable as far as it is in order to practice. Though spiritual judgements are the most common in gospel times, yet God makes use of temporal judgments also. Christ tells them what hard things they should suffer for his name's sake, and encourages them to bear up under their trials, and to go on in their work, notwithstanding the opposition they would meet with. God will stand by you, and own you, and assist you. This was remarkably fulfilled after the pouring out of the Spirit, by whom Christ gave his disciples wisdom and utterance. Though we may be losers for Christ, we shall not, we cannot be losers by him, in the end. It is our duty and interest at all times, especially in perilous, trying times, to secure the safety of our own souls. It is by Christian patience we keep possession of our own souls, and keep out all those impressions which would put us out of temper. We may view the prophecy before us much as those Old Testament prophecies, which, together with their great object, embrace, or glance at some nearer object of importance to the church. Having given an idea of the times for about thirty-eight years next to come, Christ shows what all those things would end in, namely, the destruction of Jerusalem, and the utter dispersion of the Jewish nation; which would be a type and figure of Christ's second coming. The scattered Jews around us preach the truth of Christianity; and prove, that though heaven and earth shall pass away, the words of Jesus shall not pass away. They also remind us to pray for those times when neither the real, nor the spiritual Jerusalem, shall any longer be trodden down by the Gentiles, and when both Jews and Gentiles shall be turned to the Lord. When Christ came to destroy the Jews, he came to redeem the Christians that were persecuted and oppressed by them; and then had the churches rest. When he comes to judge the world, he will redeem all that are his from their troubles. So fully did the Divine judgements come upon the Jews, that their city is set as an example before us, to show that sins will not pass unpunished; and that the terrors of the Lord, and his threatenings against impenitent sinners, will all come to pass, even as his word was true, and his wrath great upon Jerusalem.And when ye shall see Jerusalem compassed with armies,.... The Vulgate Latin, Syriac, and Persic versions read, "with an army"; that is, with the Roman army, as it was by the army which Titus Vespasian brought against it, and besieged it with:

then know that the desolation thereof is nigh; signifying, that there would be no deliverance to be expected, as when the Assyrian army under Rabshakeh appeared against it; but that whenever the Roman army besieged it, its destruction might be looked upon as inevitable; nor was the siege raised until it was destroyed, which was about four years after.