'Sound of the Trumpet' in the Bible

And it came to pass on the third day, when it was morning, that there were thunders and lightnings and a heavy cloud on the mountain, and the sound of the trumpet exceeding loud; and the whole people that was in the camp trembled.

And the sound of the trumpet increased and became exceeding loud; Moses spoke, and God answered him by a voice.

And all the people saw the thunderings, and the flames, and the sound of the trumpet, and the mountain smoking; and when the people saw it, they trembled, and stood afar off,