Ein Ayah (Hebrew: עין איה) is a commentary on Ein Yaakov - a compilation of all the Aggadic material in the Talmud - by Rabbi Abraham Isaac Kook, the first Ashkenazi chief rabbi of British Mandatory Palestine and founder of Yeshiva Mercaz HaRav Kook. Rav Kook's writings are extensive, and he is considered one of the most celebrated and influential rabbis of the 20th century. Some rabbis recommend that students of his begin studying his writings with Ein Ayah.