4 Yahweh said to Moses, “Put forth your hand, and take it by the tail.”
He put forth his hand, and laid hold of it, and it became a rod in his hand. 5 “That they may believe that Yahweh, the God of their fathers, the God of Abraham, the God of Isaac, and the God of Jacob, has appeared to you.” 6 Yahweh said furthermore to him, “Now put your hand inside your cloak.”
He put his hand inside his cloak, and when he took it out, behold, his hand was leprous, as white as snow. 7 He said, “Put your hand inside your cloak again.”
He put his hand inside his cloak again, and when he took it out of his cloak, behold, it had turned again as his other flesh. 8 “It will happen, if they will neither believe you nor listen to the voice of the first sign, that they will believe the voice of the latter sign. 9 It will happen, if they will not believe even these two signs, neither listen to your voice, that you shall take of the water of the river, and pour it on the dry land. The water which you take out of the river will become blood on the dry land.”
Matthew Henry's Commentary on Exodus 4:4-9
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.