Chullin 8 - May 8, 21 Iyar

Rabbi Zeira says in the name of Shmuel that if one heats a knife and uses it for slaughtering, the animal is not considered a treifa. Although the heat could potentially damage the animal, the sharp edge of the blade severs the windpipe and gullet before the heat from the sides of the blade can cause a burn. A question is raised regarding a person who strikes another with a hot knife, resulting in a leprous mark: is this classified as a boil (shechin) or a burn (michve)? The Gemara explores the practical halakhic implications of this distinction. Two sources are brought to resolve the matter - the first being the aforementioned statement of Rabbi Zeira - but the Gemara distinguishes between the cases and reaches no definitive conclusion. The Gemara then transitions to a discussion regarding benefit from knives used for idol worship, detailing when they are forbidden or permitted. It further addresses the status of meat slaughtered with a knife previously used for non-kosher slaughter, as well as the process for kashering a knife used on a treifa. Rav Yehuda in the name of Rav notes that a slaughterer should maintain three distinct knives: one dedicated solely to slaughtering, one for cutting meat, and one for removing cheilev (forbidden fats).