<p>Author of the Heter Iska, he served as the Rav and Av Beis Din in Shebreshin (Szczebrzeszyn), Bendin, Ludmir and Cracow. It was during his tenure in Bendin that he first formulated the Heter Iska which is used to help circumvent the prohibition of loans with interest or ribbis and the heter iska nusach contains till this day the formula "על פי תיקון מהר"מ ז"ל" or "על פי תיקון מור"ם ז"ל מקראקא" to commemorate his authorship. It was widley publicized in Siman Mem (40) through Rav Shmuel ben David haLevi's Segal's sefer Nachlas Shiva, who was the son and talmid of the Taz.</p><p>He authored the sefer BeUrim Kibdu es Hashem on Rashi's commentary for Chumash. The famed Rav Eliyahu Luntz Baal Shem was his disciple.</p>

A biographical overview of Rav Yeshayah Menachem Mendel Avigdor, the author of the Heter Iska and Av Beis Din of Cracow, including his works and legacy.

Rav Yeshayah Menachem Mendel Avigdor Av Beis Din Of Cracow

A collection of Chassidic teachings, biographies, and stories of Tzaddikim for Parshas Eikev, including extensive features on the Satmar Rebbe and the Steipler Gaon.