Now therefore go, and I will be with your mouth and teach you what you shall speak.”
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
Now therefore go, and I will be with thy mouth,.... And put words into it, and cause it to speak readily and powerfully; and so it appears that he was mighty in words, as well as in deeds, Act 7:22, and teach thee what thou shalt say; to Pharaoh, to the Israelites, and to Aaron, that was to speak for him, as is hereafter observed.
I will be with thy mouth - The Chaldee translates, My Word, meimeri, shall be with thy mouth. And Jonathan ben Uzziel paraphrases, I and my Word will be with the speech of thy mouth. See Clarke on Gen 15:1 (note), and Lev 25:10 (note).