Exodus 4:10-17

10And Moses said to Jehovah, Ah Lord! I am not eloquent, neither heretofore nor since thou hast spoken to thy servant, for I am slow of speech and of a slow tongue.

11And Jehovah said to him, Who gave man a mouth? or who maketh dumb, or deaf, or seeing, or blind? [have] not I, Jehovah?

12And now go, and I will be with thy mouth, and will teach thee what thou shalt say.

13And he said, Ah Lord! send, I pray thee, by the hand [of him whom] thou wilt send.

14Then the anger of Jehovah was kindled against Moses, and he said, Is not Aaron the Levite thy brother? I know that he can speak well. And also behold, he goeth out to meet thee; and when he seeth thee he will be glad in his heart.

15And thou shalt speak unto him, and put the words in his mouth; and I will be with thy mouth, and with his mouth, and will teach you what ye shall do.

16And he shall speak for thee unto the people; and it shall come to pass that he shall be to thee for a mouth, and thou shalt be to him for 1God.

17And thou shalt take this staff in thy hand, with which thou shalt do the signs.