The Bible is interpreted by the Talmud. Except, in Rabbinic tradition, a Talmudic law has the weight of the Biblical law. Sometimes we say in a prayer, "Blessed are Thou, O God, who has ordered us and commended us," to do something. But you don't find that "something" in the Bible; you find it in the Talmud. So Talmudic law becomes as important as Biblical law.