Exodus 3:10-12

Come now therefore, and I will send thee vnto Pharaoh, that thou maiest bring my people the children of Israel out of Egypt.

But Moses said vnto God, Who am I, that I should go vnto Pharaoh, and that I should bring the children of Israel out of Egypt?

And he answered, Certainely I will be with thee: and this shall be a token vnto thee, that I haue sent thee, After that thou hast brought the people out of Egypt, ye shall serue God vpon this Mountaine.