Speak to him, and put my words in his mouth: and I will be in thy mouth, and in his mouth, and will shew you what you must do.

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;

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.

Speak to him, and put my words in his mouth. And I will be in your mouth and in his mouth, and I will reveal to you what you must do.

Loqueris igitur ad cum, et pones verba in os ejus, et ego ero cum ore tuo, et cum ore ejus, et ostendam vobis quae sitis facturi.

Thou shalt speak - Moses thus retains his position as "mediator;" the word comes to him first, he transmits it to his brother.

I will be with thy mouth, and with his mouth - Ye shall be both, in all things which I appoint you to do in this business, under the continual inspiration of the Most High.

And thou shalt speak unto him, and (f) put words in his mouth: and I will be with thy mouth, and with his mouth, and will teach you what ye shall do.
(f) You will instruct him what to say.

And thou shalt speak unto him, and put words in his mouth,.... Or "things" (z), the matter and substance of what he should say, who being a man of words, an eloquent man, and a good spokesman, would put them into proper language, and express them fluently:
and I will be with thy mouth, and with his mouth, and will teach you what ye shall do; or speak what Moses should say to Aaron, and what Aaron should say to Pharaoh, and to the people of Israel; so that as Aaron was under Moses, and at his direction, they were both dependent on the Lord, and under his direction; and the one, as well as the other, needed his assistance, even Aaron that could speak well. Moses furnished him with matter, he put it into words, and both were instructed and influenced by the Lord what they should say and do.
(z) .

I will be with thy mouth and with his mouth - Even Aaron that could speak well, yet could not speak to purpose, unless God were with his mouth; without the constant aids of divine grace, the best gifts will fail.