Verse that support

 

there being 

an 8th trumpet.

1 Corinthians 15:52

 In a moment, in the twinkling of an eye, 

at the last trump: 

(Not seventh)

for the trumpet shall sound, 

and the dead shall be raised incorruptible, 

and we shall be changed.

1 Thessalonians 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:

(Interesting as the trumpet judgements

are all ushered in by angels

Revelation 8:6-9:21

Revelation 11:15–19)

Matthew 24:31

And he shall send his angels 

with a great sound of a trumpet, 

(Not seventh)

and they shall gather together 

his elect from the four winds, 

from one end of heaven to the other.