Exodus 19:16 (KJV)
And it came to pass on the third day in the morning that there were thunders and lightnings and a thick cloud upon the mount and the voice of the trumpet exceeding loud so that all the people that was in the camp trembled
And it came to pass on the third day in the morning that there were thunders and lightnings and a thick cloud upon the mount and the voice of the trumpet exceeding loud so that all the people that was in the camp trembled