Exodus 19:16-19 New American Bible (Revised Edition) (NABRE)
The Great Theophany. 16 On the morning of the third day there were peals of thunder and lightning, and a heavy cloud over the mountain, and a very loud blast of the shofar,[a] so that all the people in the camp trembled. 17 But Moses led the people out of the camp to meet God, and they stationed themselves at the foot of the mountain. 18 Now Mount Sinai was completely enveloped in smoke, because the Lord had come down upon it in fire. The smoke rose from it as though from a kiln, and the whole mountain trembled violently. 19 The blast of the shofar grew louder and louder, while Moses was speaking and God was answering him with thunder.