Exodus 19:7-9

7So Moses came back down from the mountain. He brought together all the leaders of the Israelites. He told them all the words that the Lord had commanded him.

8The people all replied together. They said, ‘We will do everything that the Lord has said.’ Then Moses repeated their answer to the Lord.

9The Lord said to Moses, ‘I will come to you in a thick cloud. Then the people will hear me when I speak to you. Then they will always believe what you say.’ Moses told the Lord the words that the people had said.