Isaac ben Abba Mari (1122?-93?), a French Sephardi Talmudic prodigy, wrote his first book at age seventeen. Shehitah u-Terefot, on the laws of slaughtering and consuming animals. This work was combined with others—produced over 23 years—to form his magnum opus, the Ittur Soferim, a near-complete code of Jewish law. Purported to have been unrivaled in his age in questions of Talmud, whether Yerusalyami (Jerusalem) or Bavli (Babylonian), Mari was an independent thinker, who unsparingly criticized revered and aged authorities. The present volume is composed of Ittur excerpts and Rabbi Avraham Giron’s commentaries purporting to elucidate and elaborate Mari’s work.