Exodus 4:15-17

Young's Literal Translation

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;

¹⁶ and he, he hath spoken for thee unto the people, and it hath come to pass, he -- he is to thee for a mouth, and thou -- thou art to him for God;

¹⁷ and this rod thou dost take in thy hand, with which thou doest the signs.'