Exodus 4:12

9 `And it hath come to pass, if they do not give credence even to these two signs, nor hearken to thy voice, that thou hast taken of the waters of the River, and hast poured on the dry land, and the waters which thou takest from the River have been, yea, they have become -- blood on the dry land.`

10 And Moses saith unto Jehovah, `O, my Lord, I [am] not a man of words, either yesterday, or before, or since Thy speaking unto Thy servant, for I [am] slow of mouth, and slow of tongue.`

11 And Jehovah saith unto him, `Who appointed a mouth for man? or who appointeth the dumb, or deaf, or open, or blind? is it not I, Jehovah?

12 and now, go, and I -- I am with thy mouth, and have directed thee that which thou speakest;`

13 and he saith, `O, my Lord, send, I pray thee, by the hand Thou dost send.`

14 And the anger of Jehovah burneth against Moses, and He saith, `Is not Aaron the Levite thy brother? I have known that he speaketh well, and also, lo, he is coming out to meet thee; when he hath seen thee, then he hath rejoiced in his heart,

15 and thou hast spoken unto him, and hast set the words in his mouth, and I -- I am with thy mouth, and with his mouth, and have directed you that which ye do;