Judaism is an ancient religion based on Hebrew Bible and expounded in other sacred texts, such as the Talmud and Midrash. It is monotheistic and views the Jewish people as living in an eternal covenant with God, being charged with the obligation to fulfill the commandments enjoined in the Torah. For the most part, Jews worship in Hebrew and celebrate the Sabbath on Saturday. Jews view themselves and their religion as directly descended from the ancient religion of Israel, based in the Temple in Jerusalem. Since the destruction of the Temple by the Romans in 70 CE, Jews now congregate in synagogues which serve not only as houses of prayer, but also as schools and community centers. There are about 14 million Jews world-wide and they are divided into several denominations and sub-ethic groups.