Matthew Henry on Exodus 7:8-13
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…
Read the whole note in the consoleJamieson-Fausset-Brown on Exodus 7:12
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.
Adam Clarke on Exodus 7:13
And he hardened Pharaoh's heart - ויחזק לב פרעה vaiyechezak leb Paroh, "And the heart of Pharaoh was hardened," the identical words which in Exo 7:22 are thus translated, and which should have been rendered in the same way here, lest the hardening, which was evidently the effect of his own obstinate shutting of his eyes against the truth, should be attributed to God. See Clarke's note on Exo 4:21.
John Gill on Exodus 7:13
And he hardened Pharaoh's heart,.... Or, "notwithstanding the heart of Pharaoh was hardened" (a); though he saw the rods of his magicians devoured by rod; or "therefore" (b) his heart was hardened, because he saw that the rods of his magicians became serpents as well as Aaron's; in which there was a deception of sight, and which was suffered for the hardening of his heart, there being other wonders and miracles to be wrought, for showing forth the divine power, before Israel must be let go:
that he hearkened not unto them; to Moses and Aaron, and comply with their demand, to dismiss the people of Israel:
as the Lord had said; or foretold he would not.
(a) "attamen obfirmatum est", Junius…