Exodus 19:18

19:18 Now Mount Sinai was completely covered with smoke because the Lord had descended on it in fire, and its smoke went up like the smoke of a great furnace, and the whole mountain shook violently.

Exodus 34:4

34:4 So Moses cut out two tablets of stone like the first; early in the morning he went up to Mount Sinai, just as the Lord had commanded him, and he took in his hand the two tablets of stone.

Exodus 34:29

The Radiant Face of Moses

34:29 Now when Moses came down from Mount Sinai with the two tablets of the testimony in his hand – when he came down from the mountain, Moses did not know that the skin of his face shone while he talked with him.