Nachlath Tzvi [Kabbalistic commentary to Pirkei Avoth]

Contains the rare approbation of Abraham Ha-Yachini (later one of the main proponents of the false Messiah Shabbetai Tzvi) who advised the author to eliminate all commentaries based upon the thought of Moses Cordovero. "Since the teachings of our master the Ar’i were revealed, we must divorce ourselves from other authorities." The author complied, hence much was lost to posterity