Exodus 9:10-11
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10So they took ashes from the kiln, and stood before Pharaoh, and Moses threw them toward heaven, and it became boils breaking out in sores on man and beast. 11And the magicians could not stand before Moses because of the boils, for the boils were upon the magicians and upon all the Egyptians.
Exodus 9:10-11 (RSV)