1 Thessalonians 4:15

For this we say unto you by the word of the Lord,.... The apostle having something new and extraordinary to deliver, concerning the coming of Christ, the first resurrection, or the resurrection of the saints, the change of the living saints, and the rapture both of the raised and living in the clouds to meet Christ in the air, expresses himself in this manner; either in allusion to the prophets of old, to whom the word of the Lord is said to come, and who usually introduced their prophecies with a "Thus saith the Lord"; or in distinction from his own private sense, sentiment, and opinion of things; signifying, that what he was about to say, was not a fancy and conjecture of his own, the fruit and produce of his own brain, but what he could assert upon a sure foundation, upon the best and greatest authority, even the word of the Lord; and has respect either to some particular word of Christ, as some think, such as Mt 24:30 or rather to a particular and peculiar revelation, and special instruction in these things, he had immediately from Christ; and it may be when he was caught up into the third heaven himself, and had an experience in himself of somewhat of that which both the living and raised saints shall feel, when they are caught up together in the clouds; since the change of the living saints, at the time of the resurrection of the dead, is a mystery which seems to have been first made known unto, and discovered by the Apostle Paul; see 1Co 15:51.