(8) The voice of the first sign.--Not "the voice of Moses witnessed to by the first sign" (Rosenmller), but the voice, which the sign itself might be regarded as uttering. (Comp. Psalm 105:27, where Moses and Aaron are said to have proclaimed "the words of God's signs.") A miracle speaks to men.

They will believe, i.e., most of them. Accustomed to the tricks of the serpent charmers (see Exodus 7:11 and comment ad loc.), the Israelites might be unmoved by the sight of the first miracle. They were then to be shown the second, which would be much more astonishing to them, having no parallel in their experience. This would persuade the greater number. As some, however, might still doubt, a third sign was provided. God is patient with all reasonable doubt.

Verse 8. - The voice of the first sign. Some understand "the voice of Moses as he gave them the first sign;" but it is better to regard the sign itself as speaking to them. According to the sacred writers everything that can teach us anything - day, night, the heavens, the firmament, the beasts, the fowls of the air, the fishes, nay, the very stones - have a voice. They teach us, speak to us, declare to us, cry out aloud, lift up their voice, shout, sing, proclaim God's will, whether man will hear or whether he will forbear. (See Psalm 19:1-3; Job 12:7, 3; Habakkuk 2:11; Luke 19:40, etc.) Equally, or rather much more, must a miracle be regarded as having a voice. God speaks to us by it.

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 thee,.... Will not give credit to the commission he had from God, but question the truth of it:

neither hearken to the voice of the first sign; which miracle wrought, spoke plain enough that he that wrought it, or for whose sake it was wrought, must be one come from God, or such a miracle would never be wrought by him or for him; but should any of the Israelites be still incredulous, it is supposed:

that they will believe the voice of the latter sign; which had a voice in it commanding belief that he was a messenger of God; the first sign respects his rod, the other his hand.