Many different authors contributed to the Bible. What is regarded as canonical text differs depending on traditions and groups; a number of Bible canons have evolved, with overlapping and diverging contents. The Christian Old Testament overlaps with the Hebrew Bible and the Greek Septuagint; the Hebrew Bible is known in Judaism as the Tanakh. The New Testament is a collection of writings by early Christians, believed to be mostly Jewish disciples of Christ, written in first-century Koine Greek. These early Christian Greek writings consist of Gospels, letters, and apocalyptic writings. Among Christian denominations there is some disagreement about the contents of the canon, primarily the Apocrypha, a list of works that are regarded with varying levels of respect.
Attitudes towards the Bible also differ amongst Christian groups. Roman Catholics, Anglicans and Eastern Orthodox Christians stress the harmony and importance of the Bible and sacred tradition, while Protestant churches focus on the idea of sola scriptura, or scripture alone. This concept arose during the Protestant Reformation, and many denominations today support the use of the Bible as the only source of Christian teaching.
