You shall speak - Moses thus retains his position as “mediator;” the word comes to him first, he transmits it to his brother.

Thou shalt ... put words in his mouth, that is, tell him what he is to say—provide the substance of his speeches…

And you shall speak unto him, and put words in his mouth ,
&c.] Or "things" ^F26 , the matter and substanc…

Moses continued to shrink from the work God designed him for; there was much cowardice, slothfulness, and unbelief in him. We must not judge men by…