8 Then the Lord said, "If they do not believe you or pay attention to the first sign, they may believe the second.
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.
8 "If they will not believe you," God said, "or listen to the first sign, they may believe the latter sign.
8 "So if they don't trust you and aren't convinced by the first sign, the second sign should do it.
8 "Then it will be, if they do not believe you, nor heed the message of the first sign, that they may believe the message of the latter sign.
8 The Lord said to Moses, "If they do not believe you and are not convinced by the first miraculous sign, they will be convinced by the second sign.
Matthew Henry's Commentary on Exodus 4:8
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.