Kabbalah su Esodo 20:18

Come and behold: Moses would not have been able to approach what he was looking at had he not been dressed in another garment. As it is written: "And Moses went into the midst of the cloud, and went up into the mountain" (Shemot 24:18). And he covered himself with the cloud as a person wears a garment. And then, it is written: "and Moses drew near to the thick darkness where Elohim was" (Shemot 20:18), and "Moses was in the mountain forty days and forty nights" (Shemot 24:18) and was able to see what he saw.