'Loud Trumpet Blast' in the Bible

So it happened on the third day, when it was morning, that there were thunder and flashes of lightning, and a thick cloud was on the mountain, and a very loud blast was sounded on a ram’s horn, so that all the people who were in the camp trembled.

He'll send out his angels with a loud trumpet blast, and they'll gather his elect from the four winds, from one end of heaven to another."