Exodus 24:16

Yahweh said to Moses, “Behold, I will come to you in a thick cloud, so that the people may hear when I speak with you and may also believe in you forever.” Then Moses told the words of the people to Yahweh.

And Moses said, “This is the thing which Yahweh has commanded you to do, that the glory of Yahweh may appear to you.”

then Yahweh will create over the whole area of Mount Zion and over her convocation a cloud by day, even smoke, and the brightness of a flaming fire by night; for over all the glory will be a canopy.

As the appearance of the rainbow in the clouds on a rainy day, so was the appearance of the radiance all around. Such was the appearance of the likeness of the glory of Yahweh. And I saw this, and I fell on my face and heard a sound of a voice speaking.

For when every commandment had been spoken by Moses to all the people according to the Law, he took the blood of the calves and the goats, with water and scarlet wool and hyssop, and sprinkled both the book itself and all the people,