Adam Clarke's Bible Commentary Verse 4. He put forth his hand, and caught it] Considering the light in which Moses had viewed this serpent, it required considerable faith to induce him thus implicitly to obey the command of God; but he obeyed, and the noxious serpent became instantly the miraculous rod in his hand! Implicit faith and obedience conquer all difficulties; and he who believes in God, and obeys him in all things, has really nothing to fear.
Matthew Henry Commentary
Verses 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 thos 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 miracle especially referred to the miracles of the Lord Jesus Christ. I 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 firs to cast the devil out of the body, and to heal the leprosy of the body.
Original Hebrew ויאמר559 יהוה3068 אל413 משׁה4872 שׁלח7971 ידך3027 ואחז270 בזנבו2180 וישׁלח7971 ידו3027 ויחזק2388 בו ויהי1961 למטה4294 בכפו׃3709