4 Bible Verses about Trumpets For Signalling

I was in the Spirit on the Lord's day,

After this I saw, and behold a door opened in heaven, and the first voice which I had heard, as of a trumpet talking with me, said, Come up hither, and I will shew thee things which must be hereafter.

Therefore when thou dost alms, do not sound a trumpet before thee, as the hypocrites do, in the synagogues and in the streets, that they may have glory of men. Verily I say unto you, they have their reward.

and blackness, and darkness, and tempest, And the sound of a trumpet, and the voice of words, which they that heard intreated that the word might not be spoken to them any more.