Shnei Luchot ha-Brit (the Shelah)של"ה

Isaiah Horowitz's Two Tablets of the Covenant: the encyclopedia that carried Lurianic Kabbalah into mainstream Ashkenazi piety — law, ethics, and mysticism braided so tightly that ordinary observance became kabbalistic practice. The bridge over which Safed crossed into the Polish heartland, preparing the soil Hasidism grew in.