Exodus 19:9
9 And the Lord said to Moses, “Behold, I am coming to you bin a thick cloud, that cthe people may hear when I speak with you, and may also dbelieve you forever.”
When Moses told the words of the people to the Lord,
Exodus 19:16
16 On the morning of the kthird day there were mthunders and lightnings and na thick cloud on the mountain and a very loud otrumpet blast, so that all the people in the camp ptrembled.
Matthew 17:5
5 He was still speaking when, behold, ma bright cloud overshadowed them, and ma voice from the cloud said, n“This is my beloved Son,1 with whom I am well pleased; olisten to him.”