1Co 15:52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
This is the last trump of the trumpet, not the last trumpet...The last trump will be at the end of the Tribulation...This trump will be before the Tribulation starts...
1Th 4:16 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:
1Th 4:17 Then we which are alive and remain shall 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.
You might notice that in the book of Revelation the church is no longer mentioned after the last verse in chapter 3 and doesn't pick up again til chapter 19...And what do we see at the 1st verse of chapter 4??? It's not a brass section...
Rev 4:1 After this I looked, and, behold, a door was opened in heaven: and the first voice which I heard was as it were of a trumpet talking with me; which said, Come up hither, and I will shew thee things which must be hereafter. Rev 4:2 And immediately I was in the spirit: and, behold, a throne was set in heaven, and one sat on the throne.
There was no trumpet...It was a voice, speaking words, as loud as a trumpet...
The voice of God calling out to Christians to come up hither when the times of the Gentiles are fulfilled...A picture of the Rapture of the church...
Selah! Hear here ...
4th Hebrew letter Dalet ==> Door
Rev book 4
shalom b'SHEM Yah'shua HaMashiach