You are to speak to him and put the words in his mouth. I will help both of you to speak, and I will teach you what to do.
Moses still continues backward to the service for which God had designed him, even to a fault; for now we can no longer impute it to his humility and modesty, but must own that here was too much of cowardice, slothfulness, and unbelief in it. Observe here, I. How Moses endeavours to excuse himself from the work. 1. He pleads that he was no good spokesman: O my Lord!
Commenting on Exodus 4:10-17
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...
And thou shalt speak unto him, and 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.