About this episode
Today's daf is sponsored by Lisa Elon in honor of her steadfast chevruta, Rhondda Ma Today's daf is sponsored by Lisa Elon in honor of her steadfast chevruta, Rhondda May, "May G-d grant us many more years of great learning together. " Today's daf is sponsored by Rachel Alexander Levy in memory of Jack Schuster, father of my chevruta , Rabbi Jordi Schuster. May his memory be for a blessing. Today's daf is sponsored by Adam Dicker in honor of Carolyn Hochstadter Dicker on her birthday. There is a debate between Rav and Shmuel regarding the kashering process known as niguv . In one version of the debate, Rav requires that ashes be used once during the process, while Shmuel requires them to be used twice. In another version, there is no actual disagreement—Rav simply omits the final step of rinsing with water, since its sole purpose is to remove the ashes. Shmuel, however, includes it as part of the process. How are wicker nets in a winepress kashered? Rabbi Avahu derives from the laws of purifying wicker nets that they require niguv . If the nets are made of reeds, which are more absorbent, they must be left unused for twelve months—or, according to Rabban Shimon ben Gamliel, until the next wine-making season. What is the practical difference between these two opinions? Rabbi Yossi offers an alternative to waiting a year: pouring boiling water over them. Rabban Shimon ben Gamliel cites Rabbi Yossi, suggesting instead that the nets be placed under running water for an onah . What is an onah ? Some define it as either a day or a night, while others say it means twelve hours. Rav Shmuel bar Yitzchak explains that both interpretations ultimately mean the same thing. How? The strainer and baskets used in the winepress are kashered differently depending on the material they are made from, since the level of absorption varies. If grape clusters are placed in the winepress and surrounded by the juice from the grapes, are they considered a single unit for the purposes of impurity? This has practical implications: if an am haaretz —someone who may not be trusted regarding purity laws—touches one cluster, does that render all the surrounding clusters impure? If one purchases utensils from a non-Jew, how are they to be kashered? The method depends on how the utensil was used: if used with cold food, rinse with water; if used with hot water, perform hagala (boiling); and if exposed to direct fire, apply libun (burning with fire). A knife must be polished. All these utensils also require tevila —immersion in a mikveh. Two different phrases in Bamidbar 31:23, following the battle with Midian, are cited to derive the requirement for tevila . Why are both phrases needed? Rav Nachman explains that even new utensils purchased from a non-Jew require tevila , since kashered old utensils are considered equivalent to new ones. Borrowed utensils from a non-Jew do not require tevila , but a question arises regarding utensils given to a Jew as collateral. Metal and glass utensils require tevila , but earthenware does not. If an earthenware vessel is coated with a lead glaze, should it be treated as earthenware or as metal? If utensils were used without being kashered, is food prepared in them forbidden? The answer depends on when the vessel was last used and whether one holds that a substance imparting a bad flavor is permitted or prohibited. y, "May G-d grant us many more years of great learning together. " Today's daf is sponsored by Rachel Alexander Levy in memory of Jack Schuster, father of my chevruta , Rabbi Jordi Schuster. May his memory be for a blessing. Today's daf is sponsored by Adam Dicker in honor of Carolyn Hochstadter Dicker on her birthday. There is a debate between Rav and Shmuel regarding the kashering process known as niguv . In one version of the debate, Rav requires that ashes be used once during the process, while Shmuel requires them to be used twice. In another version, there is no actual disagreement—Rav simply omits the final step of rinsing with water, since its sole purpose is to remove the ashes. Shmuel, however, includes it as part of the process. How are wicker nets in a winepress kashered? Rabbi Avahu derives from the laws of purifying wicker nets that they require niguv . If the nets are made of reeds, which are more absorbent, they must be left unused for twelve months—or, according to Rabban Shimon ben Gamliel, until the next wine-making season. What is the practical difference between these two opinions? Rabbi Yossi offers an alternative to waiting a year: pouring boiling water over them. Rabban Shimon ben Gamliel cites Rabbi Yossi, suggesting instead that the nets be placed under running water for an onah . What is an onah ? Some define it as either a day or a night, while others say it means twelve hours. Rav Shmuel bar Yitzchak explains that both interpretations ultimately mean the same thing. How? The strainer and baskets used in the winepress are kashered differently depending on the material they are made from, since the level of absorption varies. If grape clusters are placed in the winepress and surrounded by the juice from the grapes, are they considered a single unit for the purposes of impurity? This has practical implications: if an am haaretz —someone who may not be trusted regarding purity laws—touches one cluster, does that render all the surrounding clusters impure? If one purchases utensils from a non-Jew, how are they to be kashered? The method depends on how the utensil was used: if used with cold food, rinse with water; if used with hot water, perform hagala (boiling); and if exposed to direct fire, apply libun (burning with fire). A knife must be polished. All these utensils also require tevila —immersion in a mikveh. Two different phrases in Bamidbar 31:23, following the battle with Midian, are cited to derive the requirement for tevila . Why are both phrases needed? Rav Nachman explains that even new utensils purchased from a non-Jew require tevila , since kashered old utensils are considered equivalent to new ones. Borrowed utensils from a non-Jew do not require tevila , but a question arises regarding utensils given to a Jew as collateral. Metal and glass utensils require tevila , but earthenware does not. If an earthenware vessel is coated with a lead glaze, should it be treated as earthenware or as metal? If utensils were used without being kashered, is food prepared in them forbidden? The answer depends on when the vessel was last used and whether one holds that a substance imparting a bad flavor is permitted or prohibited.