Êxodo 19:9

9 The Lord said to Moses, "I am going to come to you in a dense cloud, so that the people will hear me speaking with you and will always put their trust in you." Then Moses told the Lord what the people had said.

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