Exodus 24:13-17

So Moses got up along with Joshua his servant, and Moses went up to the mountain of God.

But to the elders he said, “Wait here for us until we return to you. And behold, Aaron and Hur are with you; whoever has a legal matter, have him approach them.”

Then Moses went up to the mountain, and the cloud covered the mountain.

The glory of the Lord settled on Mount Sinai, and the cloud covered it for six days; and on the seventh day He called to Moses from the midst of the cloud.

And to the eyes of the sons of Israel, the appearance of the glory of the Lord was like a consuming fire on the mountain top.