Since Aharon had already turned the waters of Egypt into blood, it has to be explained where Pharaoh’s sorcerers found the water with which they performed their own tricks. Answers include: Aharon only turned the waters that were above the ground into blood. The Torah reports that the Egyptians dug up subterranean water to drink and it was this that the sorcerers used. (Ibn Ezra, Hizquni, Ralbag)The water in the rivers and lakes only remained as blood for a short time and the reason it was …
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