Exodus 19:7-9

7And Moses came and called for the elders of the people, and laid before their faces all these words which the Lord commanded him. 8And all the people answered together, and said, All that the Lord hath spoken we will do. And Moses returned the words of the people unto the Lord. 9And 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.