Why didn't the Mitzryim magic makers just take away the blood from the first makkah to prove to Moshe that he was just doing magic and Hashem had nothing to do with it: why did they add blood (Exodus 7:22)?
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Although I don't have a source, I would say that they didn't have the power to do that. Their point was still accomplished, though, because they proved that they could do the same as Moshe... |
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Rav Hirsch suggests an alternate explanation of the magicians’ behavior according to your suggestion: that they were attempting to undo the effects of the plague with no success—or in the case of the frogs, more frogs came when they attempted to banish them. After their third failure, they acknowledged that it was “God’s Finger” at work. |
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Imagine there was a magician claiming to have a super-natural ability to turn water into blood, and you want to discredit him and prove that it's just a trick. You would need to perform the exact illusion that the magician was performing, turn water into blood. Doing the reverse would not discredit the initial "miracle" that the magician performed. Similarly, the Egyptian magicians wanted to show Pharaoh that what Hashem could do wasn't special. In order to do that the magicians needed to repeat the same exact effect that Moshe performed. Turning it back into water would not discredit Hashem's powerful ability to turn it to blood. |
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