The most holy book of Judaism is called the Torah. It is part of the Jewish Bible, called the Tanakh, which includes the Torah and other important documents of history, poetry and writings of the prophets.
According to About.com, the Torah, also known as the Pentateuch or the Law, is comprised of the Five Books of Moses, as well as the 10 Commandments and other laws and instructions. Genesis, the first book, tells the stories of the creation of the world; Noah and the great flood; Joseph in Egypt; and Abraham and the other patriarchs. The second book, Exodus, tells of Moses freeing the Israelite slaves in Egypt and leading them to Mount Sinai, where they receive the 10 Commandments. The third book, Leviticus, deals with laws, rituals and sacrifices. The fourth book, Numbers, chronicles the wanderings of the Israelites in the desert. The fifth book, Deuteronomy, is mainly an exhortation by Moses and ends with his death before the Israelites enter the Promised Land.