Exodus 4:10-14

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 my mouth and my tongue are sluggish.” The LORD said to him, “Who placed a mouth on humans? Who makes a person mute or deaf, seeing or blind? Is it not I, the LORD? 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.