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“Sifrei Yesod” is an essential resource for Torah scholars, book collectors, and anyone interested in the foundational texts of Jewish tradition. Compiled by brothers  Betzalel  and Chaim Stefansky , this guide lists the most influential sefarim (books) in the Jewish library, encompassing various genres such as Tanach, Mishnah, Gemara, Halacha, Kabbalah, Chassidus, Midrash, Mussar, and Hashkafah.