'Blow the Trumpet' in the Bible

And I looked, and I heard one eagle flying {directly overhead}, saying with a loud voice, "Woe, woe, woe to those who live on the earth, from the remaining sounds of the trumpets of the three angels who are about to blow the trumpet!"

But in the days of the sound of the seventh angel, whenever he is about to blow the trumpet, then the mystery of God is completed, as he announced to his own slaves the prophets."