There is a very interesting Klei Yokor on Para Adumah in Parashas Chukas ומזה מי הנדה. We will use Newton’s Law known a hundred years before by the Klei Yokor. Opposiites React. The question is how can one item be both tahor and tamei? What about being two parts, water and ashes. The water is tahor whereas the ashes are tamei. The question might be for King Solomon that how is it that the ashes don’t make the water tamei? Now, if you put this on a tahor person then the water being tahor has no reaction, so the ashes make him tamei. However when you put it on a tamei person then the ashes being tamei will have no affect and he will become tahor. With this he explains the idea of hechsher. Fruits and vegetables are neutral so we need something tahor to touch them that later the tamei should have an affect on it and make it tamei.
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