Exodus 24:15

"And Moses went up into the mount, and a cloud covered the mount."

Cross References (ranked by relevance)

And the LORD said unto Moses, Lo, I come unto thee in a thick cloud, that the people may hear when I speak with thee, and believe thee for ever. And Moses told the words of the people unto the LORD.

Matthew 17:5

While he yet spake, behold, a bright cloud overshadowed them: and behold a voice out of the cloud, which said, This is my beloved Son, in whom I am well pleased; hear ye him.

Exodus 19:16

And it came to pass on the third day in the morning, that there were thunders and lightnings, and a thick cloud upon the mount, and the voice of the trumpet exceeding loud; so that all the people that was in the camp trembled.

2 Chronicles 6:1

Then said Solomon, The LORD hath said that he would dwell in the thick darkness.