Exodus 19:16-20

¹⁶It 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. ¹⁷Moses led the people out of the camp to meet God; and they stood at the lower part of the mountain. ¹⁸Mount 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. ¹⁹When the sound of the trumpet grew louder and louder, Moses spoke, and God answered him by a voice. ²⁰Yahweh came down on Mount Sinai, to the top of the mountain. Yahweh called Moses to the top of the mountain, and Moses went up.