Pesachim 6b: Bitul Chametz and Mechuyav L'Saref

Full Summary

This shiur provides a detailed analysis of Pesachim 6b, focusing on a fundamental disagreement between Rashi (רש"י) and Tosafos (תוספות) regarding bitul chametz and the obligations when chametz is found during Pesach (פסח). The Gemara (גמרא) discusses the case of someone who might find chametz on Pesach after having performed bedikah (search for chametz) and questions whether he would be willing to nullify it. Rashi's position is that the person would be 'kashe lo l'saref' (find it difficult to burn) the chametz because once found on Pesach, there is an obligation to physically destroy it, not merely nullify it. This creates a psychological reluctance that undermines the sincerity of any pre-Pesach bitul. Tosafos challenges this, arguing that if the person is already reluctant to burn chametz, why would he be more willing to nullify it, since both actions involve giving up the chametz. Rabbi Zweig explores several dimensions of this dispute. First, he examines what constitutes proper bitul - whether it requires genuine willingness to part with the chametz or merely a verbal declaration. The discussion touches on whether chametz hefker (ownerless chametz) found in one's domain creates the same obligations as one's own chametz. A significant portion of the analysis focuses on the phrase 'shema yeglus kayafa' (perhaps he will find it) and whether this refers to chametz that: (1) was present during bedikah but missed due to poor searching, (2) was in a place not subject to bedikah requirements, or (3) came into the house after bedikah was completed. Each possibility has different halachic implications. Rashi maintains that even chametz hefker in one's domain on Pesach must be burned, creating a biblical obligation ('mechuyav l'saref'). This leads to the psychological difficulty that undermines bitul. Tosafos disagrees, arguing that the reluctance to burn should logically extend to reluctance to nullify. The shiur also addresses the Gemara's question 'v'chi mishkach lo l'vatla' (can he not nullify it?) and explores whether bitul can be effective after zman isur (the time when chametz becomes prohibited). This touches on fundamental questions about the nature of bitul - whether it's a form of hefker (declaring ownerless) or a unique mechanism for chametz. Rabbi Zweig concludes by noting that this analysis has broader implications for understanding the relationship between bitul and bi'ur (physical destruction of chametz), and whether these are independent obligations or interconnected aspects of the mitzvah (מצוה) to remove chametz.