Exodus 19:4-6

4Ye have seen what I have done to the Egyptians, and [how] I have borne you on eagles' wings and brought you to myself.

5And now, if ye will hearken to my voice indeed and keep my covenant, then shall ye be my own possession out of all the peoples — for all the earth is mine —

6and ye shall be to me a kingdom of priests, and a holy nation. These are the words which thou shalt speak to the children of Israel.