Judaism is the "religion, philosophy, and way of life" of the Jewish people. Judaism, originating in the Hebrew Bible (also known as the Tanakh) and explored in later texts such as the Talmud, is considered by Jews to be the expression of the covenantal relationship God developed with the Children of Israel. According to traditional Rabbinic Judaism, God revealed his laws and commandments to Moses on Mount Sinai in the form of both the Written and Oral Torah. This was historically challenged by the Karaites who maintain that only the Written Torah was revealed, and in modern times, liberal movements such as Humanistic Judaism may be nontheistic. The Hebrews / Israelites were called (referred to) as Jews, already, as early as in the Book of Esther. The term Jews replaced the title "Children of Israel."