If you were to name one of the most important books in the world, your first choice isn’t likely to be the Codex Sinaiticus. But if you did, you’d be correct! This codex represents one of the best witnesses to the Septuagint, the Greek translation of the Hebrew Bible used by early Christians.
Handwritten in the fourth century, it also contains the oldest complete copy of the New Testament. The codex is also significant as an authoritative text for Christian communities for the content and arrangement of the Bible—a written witness to the Christian construction of the Bible.
The surviving codex is split into four parts. The largest portion of the manuscript is at The British Library in London, a partner of the Sinaiticus Project, which is a collaborative project to preserve the codex for engagement with this Book of all books!