For each subsequent century, more and more manuscripts survive that contain a portion or all of the books that were held to be part of the New Testament at that time (for example, the New Testament of the 4th-century Codex Sinaiticus, once a complete Bible, contains the Epistle of Barnabas and the Shepherd of Hermas), though occasionally these manuscripts contain other works as well (e.g., Papyrus 72 and the Crosby-Schøyen Codex). The date when a manuscript was written, however, does not necessarily reflect the date of the form of text it contains. That is, later manuscripts can, and occasionally do, contain older forms of text or older readings.