So it came about on the third day, when it was morning, that there were thunder and lightning flashes and a thick cloud over the mountain and a very loud trumpet sound, so that all the people who were in the camp trembled.

When the sound of the trumpet grew louder and louder, Moses spoke, and God answered him with thunder.

And all the people were watching and hearing the thunder and the lightning flashes, and the sound of the trumpet, and the mountain smoking; and when the people saw it all, they trembled and stood at a distance.