Judaism (Hebrew: יהדות) is the world's oldest Abrahamic religion. It is almost 4,000 years old. There are about 15 million followers. They are called Jews. It is the oldest monotheistic religion. The Torah is the most important holy book of Judaism. The laws and teachings of Judaism come from the Torah, the first five books of the Hebrew Bible and oral traditions. Some of these were first oral traditions and later written in the Mishnah, the Talmud, and other works.