Exodus 9:10-11
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10And they took ashes of the furnace, and stood before Pharaoh; and Moses sprinkled it up toward heaven; and it became a boil breaking forth with blains upon man, and upon beast. 11And the magicians could not stand before Moses because of the boils; for the boil was upon the magicians, and upon all the Egyptians.
Exodus 9:10-11 (KJV)