The Protestant Bible is a collection of sacred texts used in Protestant Christianity. It typically consists of the Old Testament and the New Testament, with the Old Testament containing 39 books, while the New Testament includes 27 books. This version of the Bible is based on the Hebrew Scriptures and the Greek texts of the New Testament. Protestants generally do not include the Apocrypha, a set of books found in the Catholic Bible. The Protestant Bible emphasizes the principle of "sola scriptura," meaning that the Bible alone is the ultimate authority in matters of faith and practice.