I come unto thee, as to the mediator between me and them, and the interpreter of my mind to them. In a thick cloud: Exodus 19:16, and compare 1 Kings 8:12 2 Chronicles 6:1. The words of the people; those mentioned Exodus 19:8. This is here repeated, because God's answer to them now follows.
Related Commentaries of Exodus 19:9
Exodus 19:9
9 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.