Aaron, Your Brother, Will Speak For You

Is not Aaron the Levite your brother? I know that he must surely speak. And also now, he is going out to greet you, and when he sees you, he will be glad in his heart. You will speak to him and put the words in his mouth. And I will be with your mouth and with his mouth, and I will instruct you what to do. He will speak to the people for you and be as a mouth for you, and you will be his superior. And take this staff in your hand, with which you will do the signs. - Exodus 4:14-17