For traditional Jews around the world, the central code of Jewish law is the 16th-century Shul?an Arukh, composed by the great Spanish-born sage Joseph Karo. This work is a consolidation of Karo’s commentary on an earlier work, the Arba’ah Turim (“Four Rows”) of Jacob ben Asher (ca. 1269-1343), a German sage who immigrated to Christian Spain with his father—himself a great Talmudist—and embodied a synthesis of Ashkenazi and Sephardi schools of learning. Part of this work was recently acquired, in the rarest forms, by the National Library of Israel. The Jerusalem Post reports: Welcome to Mosaic Create a free account...