Exodus 4:8
And it shall come to pass, if they will not believe thee, neither hearken to the voice of the first sign, that they will believe the voice of the latter sign.
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.