The magicians could not stand before Moses, because the boils had broken out on them and on all the Egyptians.
11. And the magicians could not. Since the magicians were now also at hand, doubtless they were possessed by their former folly, so that they stood in readiness, as it were, in case an opportunity of contention should be offered them.
Observe here, concerning the plague of boils and blains, I. When they were not wrought upon by the death of their cattle, God sent a plague that seized their own bodies, and touched them to the quick. If less judgments do not do their work, God will send greater.
Commenting on Exodus 9:8-12
And the magicians could not stand before Moses, because of the boils,.... Which were on them as on others, and which with all their art and skill they could not keep off; and which were so sore upon them, and painful to them, that they were obliged to withdraw, and could not stand their ground, confronting Moses, contesting and litigating with him; for it seems...