Exodus 3:11-12

But Moses said to God, “Who am I, that I should go to Pharaoh and bring the Israelites out of Egypt?”And God said, “I will be with you. And this will be the sign to you that it is I who have sent you: When you have brought the people out of Egypt, you will worship God on this mountain.”
(Exodus出埃及記3:11-12)