Heb., “teacher” or “master.” Ordained expert in Jewish worship and law. An authorized teacher of the classical Jewish tradition (see Oral Law) after the fall of the Second Temple in 70 c.e. The role of the rabbi has changed considerably throughout the centuries. Traditionally, rabbis serve as the legal and spiritual guides of their congregations and communities. The title is conferred after considerable study of traditional Jewish sources. This conferral and its responsibilities is central to the chain of tradition in Judaism.