Tertullian

Now the privilege of this favour awaits those who shall at the coming of the Lord be found in the flesh, and who shall, owing to the oppressions of the time of Antichrist, deserve by an instantaneous death, which is accomplished by a sudden change, to become qualified to join the rising saints; as he writes to the Thessalonians: "For this we say unto you by the word of the Lord, that we which are alive and remain unto the coming of the Lord shall not prevent them which are asleep. For the Lord Himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first: then we too shall ourselves be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord."