Exodus 4:10

Moses now pleads his want of eloquence. Jewish tradition says that he had an actual impediment in his speech, being unable to pronounce the labials. His words here, however, do not necessarily imply any positive defect of this kind. He wishes to be excused, and urges that a more eloquent man than he is required to persuade the king of Egypt to release Israel, and the Israelites also to trust themselves to the guidance of Jehovah. For this he is rebuked, but not excused. Aaron is given to him as spokesman.