Exodus 19:5-8

5If you carefully obey me and are faithful to the terms of my promise, then out of all the nations you will be my own special possession, even though the whole world is mine.

6You will be my kingdom of priests and my holy nation.’ These are the words you must speak to the Israelites.”

7So Moses went down and called for the leaders of the people. He repeated to them all the words that the Lord had commanded him.

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