Exodus 4:15-19

So you are to speak to him and put the words in his mouth; and I Myself will be with your mouth and his mouth, and I will instruct you in what you are to do.

He shall speak for you to the people; and he will be as a mouth for you and you will be as God to him.

And you shall take in your hand this staff, with which you shall perform the signs.”

Then Moses departed and returned to his father-in-law Jethro, and said to him, “Please, let me go, that I may return to my brothers who are in Egypt, and see if they are still alive.” And Jethro said to Moses, “Go in peace.”

Now the Lord said to Moses in Midian, “Go back to Egypt, for all the men who were seeking your life are dead.”