(18) There shall not an hair of your head perish.--The promise does not meet us in this form in the parallel passages of the two other Gospels. A like promise meets us in Matthew 10:30, Luke 12:7. The very same phrase occurs, however, almost as if it were a quotation from this Gospel, in St. Paul's address to the sailors, in Acts 27:34.

Verse 18. - But there shall not an hair of your head perish. Not, of course, to be understood literally; for comp. ver. 16. Bengel's comment accurately paraphrases it: "Not a hair of your head shall perish without the special providence of God, nor without reward, nor before the due time." The words, too, had a general fulfillment; for the Christian community of Palestine, warned by this very discourse of the Lord's, fled in time from the doomed city, and so escaped the extermination which overtook the Jewish people in the great war which ended in the fall of Jerusalem (A.D. 70).

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.But there shall not art hair of your head perish. That is, without the will of God, as in Matthew 10:29 or not one shall perish, but what shall be restored again: or the sense is, that though they should be betrayed by their friends, and hated, and persecuted, and imprisoned by their enemies, yet they should be no losers in the main; all things should work together for their good; and though even they should be put to death, yet that would be to their advantage, since instead of a temporal, troublesome life, they should enjoy an eternal and happy one: for this cannot be understood of entire preservation from all corporeal damages and hurt; seeing it is, before declared, that they should be put into prisons, and some of them put to death; nor of their preservation at the destruction of Jerusalem, for none of them was living at that time, but the Apostle John, and he was not in those parts.