The first time that Moses made his application to Pharaoh, he produced his instructions only; now he is directed to produce his credentials, and does accordingly. 1. It is taken for granted that Pharaoh would challenge these demandants to work a miracle, that, by a performance evidently above the power of nature, they might prove their commission from the God of nature. Pharaoh will say, Show a miracle; not with any desire to be convinced, but with the hope that none will be wrought, and then he would have some colour for his infidelity. 2. Orders are therefore given to turn the rod into a serpent, according to the instructions, Exo 4:3. The same rod that was to give the signal of the other miracles is now itself the subject of a miracle, to put a reputation upon it. Aaron cast his rod to the ground, and instantly it became a serpent, Exo 7:10. This was proper, not only to affect Pharaoh with wonder, but to strike a terror upon him. Serpents are hurtful dreadful animals; the very sight of one, thus miraculously produced, might have softened his heart into a fear of that God by whose power it was produced. This first miracle, though it was not a plague, yet amounted to the threatening of a plague. If it made not Pharaoh feel, it made him fear; and this is God's method of dealing with sinners - he comes upon them gradually. 3. This miracle, though too plain to be denied, is enervated, and the conviction of it taken off, by the magicians' imitation of it, Exo 7:11, Exo 7:12. Moses had been originally instructed in the learning of the Egyptians, and was suspected to have improved himself in magical arts in his long retirement; the magicians are therefore sent for, to vie with him. And some think those of that profession had a particular spite against the Hebrews ever since Joseph put them all to shame, by interpreting a dream which they could make nothing of, in remembrance of which slur put on their predecessors these magicians withstood Moses, as it is explained, Ti2 3:8. Their rods became serpents, real serpents; some think, by the power of God, beyond their intention or expectation, for the hardening of Pharaoh's heart; others think, by the power of evil angels, artfully substituting serpents in the room of the rods, God permitting the delusion to be wrought for wise and holy ends, that those might believe a lie who received not the truth: and herein the Lord was righteous. Yet this might have helped to frighten Pharaoh into a compliance with the demands of Moses, that he might be freed from these dreadful unaccountable phenomena, with which he saw himself on all sides surrounded. But to the seed of the serpent these serpents were no amazement. Note, God suffers the lying spirit to do strange things, that the faith of some may be tried and manifested (Deu 13:3; Co1 11:19), that the infidelity of others may be confirmed, and that he who is filthy may be filthy still, Co2 4:4. 4. Yet, in this contest, Moses plainly gains the victory. The serpent which Aaron's rod was turned into swallowed up the others, which was sufficient to have convinced Pharaoh on which side the right lay. Note, Great is the truth, and will prevail. The cause of God will undoubtedly triumph at last over all competition and contradiction, and will reign alone, Dan 2:44. But Pharaoh was not wrought upon by this. The magicians having produced serpents, he had this to say, that the case between them and Moses was disputable; and the very appearance of an opposition to truth, and the least head made against it, serve those for a justification of their infidelity who are prejudiced against the light and love of it.

Aaron's rod swallowed up their rods - As Egypt was remarkably addicted to magic, sorcery, etc., it was necessary that God should permit Pharaoh's wise men to act to the utmost of their skill in order to imitate the work of God, that his superiority might be clearly seen, and his powerful working incontestably ascertained; and this was fully done when Aaron's rod swallowed up their rods. We have already seen that the names of two of the chief of these magicians were Jannes and Jambres; see Clarke on Exo 2:10 (note), and Ti2 3:8 (note). Many traditions and fables concerning these may be seen in the eastern writers.

For they cast down every man his rod, and they became serpents,.... That is, they seemed to be so, as Josephus (z) expresses it, but not really, in which he is followed by many; though some think that the devil assisted in this affair, and in an instant, as soon as the rods were cast down, removed them and put real serpents in their room:

but Aaron's rod swallowed up their rods; that is, the serpent that Aaron's rod was turned into, swallowed up the rods of the magicians, which never were otherwise than rods only in appearance; or if real serpents were put in the room of them, these were devoured by his serpent called his rod, because it was before turned into a serpent, as Aben Ezra observes; though the Targums of Jonathan, Jarchi, and R. Jeshua, suppose this was done after the serpent became a rod again; which makes the miracle the greater and more wonderful, that a rod should devour other rods; and supposing them real serpents, this was what the magicians could not make their rods do, and in which they were outdone by Aaron.

(z) Antiqu. ut supra. (l. 2. c. 13 sect. 3.)

but Aaron's rod swallowed up their rods--This was what they could not be prepared for, and the discomfiture appeared in the loss of their rods, which were probably real serpents.