The Catechism in Questions & Answers

558. How is the return of Christ described in the letters of Apostle Paul?

In 1 Thessalonians 4: 15-17 it says: “For this we say to you by the word of the Lord, that we who are alive and remain until the coming of the Lord will by no means precede those who are asleep. For the Lord Himself will descend from heaven with a shout, with the voice of an archangel, and with the trumpet of God. And the dead in Christ will rise first. Then we who are alive and remain shall be caught up together with them in the clouds to meet the Lord in the air. And thus we shall always be with the Lord.”
In 1 Corinthians 15: 51-52 we read: “Behold, I tell you a mystery: We shall not all sleep, but we shall all be changed—in a moment, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, and the dead will be raised incorruptible, and we shall be changed.”
In Philippians 3: 20-21 we find the statement: “For our citizenship is in heaven, from which we also eagerly wait for the Saviour, the Lord Jesus Christ, who will transform our lowly body that it may be conformed to His glorious body, according to the working by which He is able even to subdue all things to Himself."