On the third day, when it was morning, 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. Moses led the people out of the camp to meet God; and they stood
at the lower part of the mountain. All of Mount Sinai smoked,
because Yahweh descended on it in fire; and its smoke ascended like the smoke
of a furnace, and the whole mountain quaked greatly. When the sound of the
trumpet grew louder and louder, Moses spoke, and God answered him by a
voice. Yahweh came down on Mount Sinai, to the top of the mountain. Yahweh
called Moses to the top of the mountain, and Moses went up.
Yahweh said to Moses, “Go down, warn the people, lest they
break through to Yahweh to gaze, and many of them perish. Let the
priests also, who come near to Yahweh, sanctify themselves, lest Yahweh break
out on them.”
Exodus 19:16-22