Charles Ellicott Commentary Exodus 9:11

"And the magicians could not stand before Moses because of the boils; for the boils were upon the magicians, and upon all the Egyptians." — Exodus 9:11 (ASV)

The magicians could not stand before Moses. —It is uncertain whether the magicians were present accidentally, or had come for the express purpose of withstanding Moses (2 Timothy 3:8). The latter may be suspected, as the plague was made to fall with special violence upon them.