put words (Hebrew "the words ") in his mouth. Compare Numbers 23:5; Numbers 23:16; Numbers 22:35.Deuteronomy 18:18; John 17:8. This is. definition of Divine inspiration.
I will be. Hebrew. 'ehyeh. See on Exodus 3:14; Exodus 3:15.
Related Commentaries of Exodus 4:15
Exodus 4:15
15 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.