Parallel
Exodus 19:16
Brenton's English Septuagint · Berean Standard Bible
And it came to pass on the third day, as the morning drew nigh, there were voices and lightnings and a dark cloud on mount Sina: the voice of the trumpet sounded loud, and all the people in the camp trembled.
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.