41 Moses objected, "They won't trust me. They won't listen to a word I say. They're going to say, 'God? Appear to him? Hardly!'" 2 So God said, "What's that in your hand?" "A staff." 3 "Throw it on the ground." He threw it. It became a snake; Moses jumped back - fast! 4 God said to Moses, "Reach out and grab it by the tail." He reached out and grabbed it - and he was holding his staff again. 5 "That's so they will trust that God appeared to you, the God of their fathers, the God of Abraham, the God of Isaac, and the God of Jacob." 6 God then said, "Put your hand inside your shirt." He slipped his hand under his shirt, then took it out. His hand had turned leprous, like snow. 7 He said, "Put your hand back under your shirt." He did it, then took it back out - as healthy as before. 8 "So if they don't trust you and aren't convinced by the first sign, the second sign should do it. 9 But if it doesn't, if even after these two signs they don't trust you and listen to your message, take some water out of the Nile and pour it out on the dry land; the Nile water that you pour out will turn to blood when it hits the ground."
10 Moses raised another objection to God: "Master, please, I don't talk well. I've never been good with words, neither before nor after you spoke to me. I stutter and stammer." 11 God said, "And who do you think made the human mouth? And who makes some mute, some deaf, some sighted, some blind? Isn't it I, God? 12 So, get going. I'll be right there with you - with your mouth! I'll be right there to teach you what to say." 13 He said, "Oh, Master, please! Send somebody else!" 14 God got angry with Moses: "Don't you have a brother, Aaron the Levite? He's good with words, I know he is. He speaks very well. In fact, at this very moment he's on his way to meet you. When he sees you he's going to be glad.
Matthew Henry's Commentary on Exodus 4:1-14
Commentary on Exodus 4:1-9
(Read Exodus 4:1-9)
Moses objects, that the people would not take his word, unless he showed them some sign. God gives him power to work miracles. But those who are now employed to deliver God's messages to men, need not the power to work miracles: their character and their doctrines are to be tried by that word of God to which they appeal. These miracles especially referred to the miracles of the Lord Jesus Christ. It belonged to Him only, to cast the power of the devil out of the soul, and to heal the soul of the leprosy of sin; and so it was for Him first to cast the devil out of the body, and to heal the leprosy of the body.
Commentary on Exodus 4:10-17
(Read Exodus 4:10-17)
Moses continued backward to the work God designed him for; there was much of cowardice, slothfulness, and unbelief in him. We must not judge of men by the readiness of their discourse. A great deal of wisdom and true worth may be with a slow tongue. God sometimes makes choice of those as his messengers, who have the least of the advantages of art or nature, that his grace in them may appear the more glorious. Christ's disciples were no orators, till the Holy Spirit made them such. God condescends to answer the excuse of Moses. Even self-diffidence, when it hinders us from duty, or clogs us in duty, is very displeasing to the Lord. But while we blame Moses for shrinking from this dangerous service, let us ask our own hearts if we are not neglecting duties more easy, and less perilous. The tongue of Aaron, with the head and heart of Moses, would make one completely fit for this errand. God promises, I will be with thy mouth, and with his mouth. Even Aaron, who could speak well, yet could not speak to purpose, unless God gave constant teaching and help; for without the constant aid of Divine grace, the best gifts will fail.