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 the Lord said to Moses, See, I will come to you in a thick cloud, so that what I say to you may come to the ears of the people and they may have belief in you for ever. And Moses gave the Lord word of what the people had said.