 While there have been Jewish groups whose beliefs were based on the written text of the Torah alone (e.g., the Sadducees, and the Karaites), most Jews believe in the oral law.These oral traditions were transmitted by the Pharisee school of thought of ancient Judaism and were later recorded in written form and expanded upon by the rabbis.According to Rabbinical Jewish tradition, God gave both the Written Law (the Torah) and the Oral law to Moses on Mount Sinai.