Exodus 4:10-16

And Moses said to Yahweh, “Please, Lord, I am not a man of words, neither recently nor in the past nor since your speaking to your servant, because I am heavy of mouth and of tongue.” And Yahweh said to him, “Who gave a mouth to humankind, or who makes mute or deaf or sighted or blind? Is it not I, Yahweh? So then go, and I myself will be with your mouth, and I will teach you what you must speak.” And he said, “Please, Lord, do send anyone else whom you wish to send.” And Yahweh was angry with Moses and said, “Is there not Aaron your brother the Levite? I know that he certainly can speak, and also there he is coming out to meet you, and when he sees you, he will rejoice in his heart. And you will speak to him, and you will put words in his mouth, and I myself will be with your mouth and with his mouth, and I will teach you what you must do. And he will speak for you to the people, and then he will be to you as a mouth, and you will be to him as a god.