Exodus 19:18-20

CLV(i) 18 As for Mount Sinai, all of it smoked in view of the fact that Yahweh descended on it in fire; its smoke ascended as the smoke of a limekiln, and the entire mountain trembled exceedingly. 19 While the sound of the trumpet came to be going, becoming exceedingly steadfast, Moses was speaking, and the One, Elohim was answering with a loud voice. 20 Yahweh descended on Mount Sinai to the summit of the mountain; then Yahweh called Moses to the summit of the mountain, and Moses ascended.