Exodus 4:10-16

10But Moses said to the Lord, "Oh, my Lord, I am not eloquent, either in the past or since you have spoken to your servant, but I am slow of speech and of tongue."

11Then the Lord said to him, "Who has made man's mouth? Who makes him mute, or deaf, or seeing, or blind? Is it not I, the Lord?

12Now therefore go, and I will be with your mouth and teach you what you shall speak."

13But he said, "Oh, my Lord, please send someone else."

14Then the anger of the Lord was kindled against Moses and he said, "Is there not Aaron, your brother, the Levite? I know that he can speak well. Behold, he is coming out to meet you, and when he sees you, he will be glad in his heart.

15You shall speak to him and put the words in his mouth, and I will be with your mouth and with his mouth and will teach you both what to do.

16He shall speak for you to the people, and he shall be your mouth, and you shall be as God to him.