Exodus 19
16 Ref It happened on the third day, when it was morning, that there were thunders and lightnings, and a thick cloud on the mountain, and the sound of an exceedingly loud trumpet; and all the people who were in the camp trembled.
17 Ref Moses led the people out of the camp to meet God; and they stood at the lower part of the mountain.
18 Ref Mount Sinai, the whole of it, smoked, because Yahweh descended on it in fire; and its smoke ascended like the smoke of a furnace, and the whole mountain quaked greatly.
19 Ref When the sound of the trumpet grew louder and louder, Moses spoke, and God answered him by a voice.