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When exactly does one violate Shabbos (שבת) by placing bread in an oven - immediately upon placement or only when the bread cooks? The shiur analyzes a fundamental machloket between Tosafos (תוספות) and Chachmei Lunel about whether 'lo sa'aseh melacha' prohibits the action leading to work or only the completed result itself. This chakira has major implications for removing items from ovens and distinguishing between intentional versus unintentional violations.
This shiur presents a groundbreaking analysis of the fundamental nature of Shabbos (שבת) transgression through the sugya of hidbik pas bitanur (placing bread in an oven). Rabbi Zweig explores a fundamental machloket between Tosafos (תוספות) and the Chachmei Lunel regarding when exactly a Shabbos violation occurs. The central question revolves around understanding the Torah (תורה)'s command 'lo sa'aseh kol melacha' - whether melacha functions as a noun describing a forbidden result, or whether the prohibition targets the action that leads to melacha. Tosafos maintains that when one places bread in an oven on Shabbos, the transgression occurs immediately with the action itself. According to this view, the person has already violated Shabbos through the act of placement, regardless of when the bread actually bakes. The Chachmei Lunel, however, present a revolutionary perspective: the act of placing bread creates only achrayus (responsibility) for the eventual chilul Shabbos, but no actual transgression occurs until the bread is cooked. The placing itself is merely a ma'aseh that generates responsibility, not an issur chamur.
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Shabbos 4a
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