This chapter – based extensively on the research by Professor Eyal Regev[1] − examines the theological differences between the Sadducees (צָדוֹקִים - Tzadokim) and Pharisees (פְּרוּשִׁם - Perushim). It identifies the differences between the early class of Jewish priests, known as the Sadducees, and an emerging rabbinic class, known as the Pharisees. It focuses on the moment when rabbinic Judaism, as we understand it, became the more dominant force in the future development of Jewish history, as the nascent rabbinic sages (Pharisees) began to displace the established Temple priests (Sadducees)