The Bible is a collection of sixty-six books, thirty-nine being classified as Old Testament books, and twenty-seven classified as New Testament books. It is not a book written by one author, but rather by many authors. According to tradition, the books were written over a period of more than one thousand years. The traditional authorship of many Biblical books has historically been doubted by a majority of scholars. This, and other topics relevant to each writing, form the basis of the following pages.