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.
8. And it shall come to pass, if they will not believe thee. In these words God took away from Moses every handle for doubt; as much as to say, that he was sufficiently provided and strengthened to overcome the stubbornness of the people; and yet, heaping up the measure to overflowing, he afterwards added a third sign, from whence Moses might attain full confidence...
Moses objects that the people will not believe him, yet God had promised they would hearken. His doubt does not square with God's word; past rejection made him fear the same again, though he was happily mistaken. The signs God appointed would convince them where bare word could not.
AI summary
Commenting on Exodus 4:1-9
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...