Exodus 24:16-18 New Century Version (NCV)
16 The glory of the Lord came down on Mount Sinai, and the cloud covered it for six days. 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 fire burning on top of the mountain. 18 Then Moses went into the cloud and went higher up the mountain. He was on the mountain for forty days and forty nights.