15 So Moses went up on the mountain, and the cloud covered it.
16 The glory of the Lord settled on Mount Sinai. For six days the cloud covered it, and on the seventh day the Lord called to Moses from inside the cloud.
17 To the Israelites, the glory of the Lord looked like a raging fire on top of the mountain.
18 Moses entered the cloud as he went up the mountain. He stayed on the mountain 40 days and 40 nights.