The rabbinic prohibition against eating matzah on Erev Pesach and the status of matzah that can’t be used to fulfill the mitzvah of matzah such as matzah baked by a non-Jew and egg matzah/matzah ashira).
This shiur is reposted with permission from the VBM—The Israel Koschitzky Virtual Beit Midrash of Yeshivat Har Etzion