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When wearing shatnez is forbidden—does it require kavana for warmth (hana'as chimu), mere intention to wear (kavana levisha), or any amount of benefit? The shiur develops multiple ways to reconcile the two pesukim (lo ya'aleh and lo tilbash), exploring whether shatnez needs intent for warmth, actual warmth, or just the act of wearing, and whether wearing a garment as a shawl differs halachically from wearing it properly.
This shiur presents a comprehensive analysis of the Gemara (גמרא) in Yevamos 4b discussing the halachic requirements for the prohibition of shatnez (wearing a mixture of wool and linen). The core question revolves around understanding two seemingly redundant Biblical prohibitions: "lo ya'aleh alecha" in Vayikra and "lo tilbash" in Devarim. The shiur explores what additional information each verse provides and how they work together to define the parameters of the issur. The Gemara's kamashma lan (what the verse comes to teach us) centers on whether one needs: (1) kavana for hana'as chimu (intention to derive warmth), (2) actual hana'ah (benefit/warmth) from the garment, and/or (3) kavana levisha (intention to wear as clothing). The shiur presents Rashi (רש"י)'s position that if the Torah (תורה) had only said "lo ya'aleh," one might think shatnez is forbidden even without kavana for warmth. The chiddush of "lo tilbash" teaches that one needs kavana for hana'ah—intent to derive benefit from wearing it. Conversely, if it had only said "lo tilbash," one might require significant hana'ah (substantial warmth). "Lo ya'aleh" teaches that even minimal hana'ah suffices.
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Yevamos 4b
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