Exodus 4
14 Ref And the Lord was angry with Moses, and said, Is there not Aaron, your brother, the Levite? To my knowledge he is good at talking. And now he is coming out to you: and when he sees you he will be glad in his heart.
15 Ref Let him give ear to your voice, and you will put my words in his mouth; and I will be with your mouth and with his, teaching you what you have to do.