(9) Shall become blood.--The verb is repeated in the Hebrew, which intensifies the assertion. The English equivalent of the phrase used would be, "shall assuredly become." The signs were, no doubt, selected primarily for facility of exhibition; but they may also have been intended to be significant. The change of a rod into a serpent showed that a feeble implement might become a power to chastise and to destroy. That of a healthy into a leprous hand, and the reverse, indicated that Moses's mission was both to punish and to save; while the change of water into blood suggested--albeit vaguely--the conversion of that peace and prosperity, which Egypt was enjoying, into calamity, suffering, and bloodshed.

Verse 9. - If they will not believe also. "Even" would be a better translation than "also." The river is of course "the Nile." See the comment on Exodus 2:3. Of the three signs given, the first would probably convince all those who were religious, well-disposed, and fair-minded; the second, acting upon their fears, would move all but the desperately wicked, who despised Jehovah and put their trust in the gods of the Egyptians (Joshua 24:14; Ezekiel 20:7, 8; Ezekiel 23:3, 8, etc.). The third sign was for these last, who would regard the Nile as a great divinity, and would see in the conversion of Nile water into blood a significant indication that the God who had commissioned Moses was greater than any Egyptian one.

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.And it shall come to pass, if they will not believe also these two signs,.... Performed before their eyes; for these were done over again when Moses came into Egypt to the Israelites, and yet some of them might still remain unbelievers to his commission, and so to the voice of these signs, which loudly called for their faith:

neither hearken unto thy voice; affirming he came from God, and was sent to be the deliverer of them:

that thou shalt take of the water of the river; of the river Nile, when he should come into Egypt; wherefore Josephus (q) is mistaken when he intimates that this was done at the same time with the other signs; and was water he took near at hand and poured on the ground: but Philo (r) truly refers this to Egypt, where it was done, as it ought to be:

and pour it upon the dry land, and the water which thou takest out of the river shall become blood upon the dry land; by which it would appear how easily the Lord could destroy the land of Egypt, and make it a barren land, whose fertility was owing to the overflow of the river Nile as a means; and this would be a specimen also of what he would do hereafter, in turning the waters of the river into blood, thereby avenging the blood of innocent babes drowned there by the Egyptians.

(q) Antiqu. l. 2. c. 12. sect. 3.((r) De Vita Mosis, l. 1. p. 614.