Judaism originated with Abraham and his descendants, including Isaac, Jacob, and Jacob's 12 sons who became the 12 tribes of Israel. The Torah contains the five books of Moses and is a holy book for Jews. Core beliefs include that there is one God who created the world and has given 613 commandments for Jews to follow, most importantly the Ten Commandments. Jerusalem and synagogues are important places of worship. Rites of passage include bar/bat mitzvahs and following kosher dietary laws and observing the Sabbath. Major holidays include Purim, Chanukah, and Yom Kippur.