Joel 2:32 - Matthew Poole's English Annotations on the Holy Bible

Yet when nature seems out of course, and such terrible convulsions overthrow all states and kingdoms, and nothing but ruin and destruction appear on every side, yet then most certainly it shall come to pass, that whosoever shall call on the name of the Lord; whoso heareth the gospel, repenteth of sin, believeth in Christ, and prayeth for grace, peace, and glory; whoso worshippeth the Father through the Son in truth and faith; shall be delivered; either delivered from those sad outward afflictions, or else, which is infinitely better, from eternal miseries, which will swallow up the unbelieving and impenitent world. When the Jews who rejected Christ were destroyed by the Romans, all (as Eusebius reports) the Jews that believed in Christ and submitted to the gospel escaped. In Mount Zion; in the true church, typified by Zion, the city of David; and in Jerusalem; not local Jerusalem; there was the chief place of slaughter, blood, fire, and death; but mystical Jerusalem, the church and city of the Messiah; shall be deliverance; salvation, whether temporal or eternal, or both; as the Lord hath said; according as God hath promised; and this promised deliverance gives the believer satisfaction and rest, whether in life or by death. And in the remnant, not of the Jews only, but of the Gentiles also, whom the Lord shall call; called of God to be his peculiar people; called to the knowledge of Christ, to profess his name, to believe in Christ, and by him to wait for eternal life and glory, 1 Thessalonians 10:16 Acts 13:46 Romans 11:4,5,7.