Bible Verses About Trumpet: Heard at Mount Sinai at giving of the law

On the third day, when morning came, there was thunder and lightning. A thick cloud was upon the mountain, and a very loud blast of the ram’s horn went out, so that all the people in the camp trembled.

When all the people witnessed the thunder and lightning, the sounding of the ram’s horn, and the mountain enveloped in smoke, they trembled and stood at a distance.