Leviticus 11:43ויקרא י״א:מ״ג
You shall not draw abomination upon yourselves through anything that swarms; you shall not make yourselves impure therewith and thus become impure.
Yoma 39a:2יומא ל״ט א:ב׳
In the school of Rabbi Yishmael it was taught: Sin stupefies the heart of a person who commits it, as it is stated: “And do not impurify yourselves with them, so that you should not be thereby impurified” (Leviticus 11:43) Do not read that term as: “And be impurified [venitmetem]”; rather, read it as: And your hearts will be stupefied [venitamtem].
Rashi on Yoma 39a:2:1רש"י על יומא ל״ט א:ב׳:א׳
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Tosafot on Chullin 5b:10:1תוספות על חולין ה׳ ב:י׳:א׳
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Responsa Rav Pealim, Volume IV, Sod Yesharim 6:1שו"ת רב פעלים, חלק ד, סוד ישרים ו׳:א׳
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Haamek Davar on Deuteronomy 6:10:1העמק דבר על דברים ו׳:י׳:א׳
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