Exodus 19:7-9

7So Moses went back and summoned the elders of the people and set before them all the words the Lord had commanded him to speak.

8The people all responded together, “We will do everything the Lord has said.” So Moses brought their answer back to the Lord.

9The 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.