Exodus 4:10-16

But Moses replied to the LORD, “Please, Lord, I have never been eloquent — either in the past or recently or since You have been speaking to Your servant — because I am slow and hesitant in speech.” Yahweh said to him, “Who made the human mouth? Who makes him mute or deaf, seeing or blind? Is it not I, Yahweh? Now go! I will help you speak and I will teach you what to say.” Moses said, “Please, Lord, send someone else.” Then the LORD’s anger burned against Moses, and He said, “Isn’t Aaron the Levite your brother? I know that he can speak well. And also, he is on his way now to meet you. He will rejoice when he sees you. You will speak with him and tell him what to say. I will help both you and him to speak and will teach you both what to do. He will speak to the people for you. He will be your spokesman, and you will serve as God to him.