Believed founded by Abraham, a Hebrew chieftain originally from the Babylonian city of Ur. Tradition has it that he taught his people to worship one God, YHWH (Yahweh, or Jehovah). It’s chief writings are contained in the Torah, which reveals the will of god as stated in the Pentateuch (the first five books of the Old Testament), as well as the Talmud, which contains the Rabbinical religious and civil laws.