Study Guide Pesachim 29 Today's Daf is sponsored by Judi Felber on the second yartzeit of Yovel MorYosef and Yossi Cohen, who were killed in a terror attack at Givat Assaf and for the continued Refuah Shelema of her son, Netanel Ilan ben Shayna Tzpora. And by Sylvia Simmons to mark the 8th yahrzeit of her mother, Pessy Simmons z”l, "whose lifelong dedication to Jewish values and learning inspired many during her long life with a reflective, enquiring mind; and who would be enthused by the opportunities offered by Hadran to the next generation of Jewish women." To which tannaitic opinion can the mishna be attributed to, that forbids to benefit from chametz of a Jew that was owned by the Jew over Pesach and permits the same of a gentile? Rav Acha bar Yaakov and Rava answer the question each in a different way. According to Rav Acha bar Yaakov, Rabbi Yehuda holds that chametz of a gentile or that was sanctified is permitted to a Jew not only to benefit from but also to eat. However, the gemara says that Rav Acha changed his mind and to prove it they quote a braita regarding one who ate chametz on Pesach that was sanctified - is one obligated for meila or not. In order to explain the tannaitic debate in the braita, the gemara brings five explanations, one of them by Rav Acha bar Yaakov. From his explanation, one can understand that he changed his mind as he explains that Rabbi Yehuda holds that chametz of sanctified items is forbidden on Pesach. The next topic the gemara discusses is chametz mixed in with permitted foods - both on Pesach and chametz that was owned by a Jew on Pesach. Do regular laws of nullification apply? Rav, Shmuel and Rabbi Yochanan disagree.