This week's learning is dedicated by Carolyn Hochstadter, Adam Dicker and family on the 17th yahrzeit of Fred Hochstadter, Ephraim ben Kayla v'Baruch this Monday, 8 Elul. "'Dad' was a holocaust survivor who was saved via the Kindertransport, came to Canada and met 'Ma' in Montreal. Together, they built a family, business, community, and legacy of support and love for Medinat Yisrael. We miss you and are managing to catch up on some of your reading material, including Menachem Elon's Mishpat Ivri — to which Hadran's Daf Yomi has given so much background and context. We continue to laugh at your jokes and follow your wise guidance. And also in honor of today's pidyon haben of our first Sabra grandchild, Zecharia Ami - Zach. Saba and Savta would be proud."

Today's daf is sponsored by Rochel Cheifetz in commemoration of her husband's, Aryeh Leib ben Yehuda, Lenny Cheifetz's, 33rd yahrzeit. "You were taken much too soon. But I thank HKB"H for the time we were blessed with your smile, goodness, sense of humor, and love. Yehi zichro baruch."

Today's daf is sponsored by Emma Rinberg for a refuah shlemah for her son Joseph, Yosef Yitzchak Nisan Ben Nechama Leah Esther, who is having surgery today to repair a broken femur after a bike accident.

The Mishna lists various items that are forbidden to derive benefit from and remain prohibited even in the smallest amount when mixed with permitted substances. The Gemara asks and explains why certain items are not included in the Mishna's list.

If yayin nesech falls into a pit, the entire quantity of wine becomes forbidden. However, Rabban Shimon ben Gamliel ruled that the mixture may be sold, provided the value of the yayin nesech is deducted from the sale price. There is a debate among the amoraim about whether we rule like Rabban Shimon ben Gamliel in all cases, or only in specific situations—such as when a barrel of yayin nesech is mixed with a barrel of permitted wine, as opposed to a smaller quantity of forbidden wine that is mixed into a jug or barrel of permitted wine.

To kasher a winepress that was used by or prepared by a non-Jew, the process depends on the material from which the winepress is made and whether it was lined with pitch.