Torah, first five books of the Bible. Genesis, Exodus, Leviticus, Numbers, Deuteronomy.
"With the many historical forms of Judaism, they all share similar characteristics. The most essential characteristic is the belief in one God who created the universe and continues to rule it. The God who created the world revealed himself to the Israelites at Mount Sinai." (http://library.thinkquest.org/28505/judaism/centr.htm)