Shemot 4:12

12 Now therefore go, and Eh-heh-yeh (I will be) with thy mouth, and teach thee what thou shalt say.

Shemot 4:12 Meaning and Commentary

Exodus 4:12

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, ( Acts 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.

Shemot 4:12 In-Context

10 And Moshe said unto Hashem, O Adonoi, I am not an ish devarim, neither heretofore, nor since Thou hast spoken unto Thy eved; but I am slow of speech, and of a slow lashon.

11 And Hashem said unto him, Who hath made man’s peh (mouth)? Or who maketh dumb, or deaf, or seeing, or blind? Is it not I, Hashem?

12 Now therefore go, and Eh-heh-yeh (I will be) with thy mouth, and teach thee what thou shalt say.

13 And he said, O Adonoi, send, now, by the yad of him whom Thou wilt send.

14 And the Af Hashem was kindled against Moshe, and He said, Is there not Aharon thy ach the Levi? I know that he can speak well. And also, hinei, he cometh forth to meet thee; and when he seeth thee, he will be glad in his lev.