Sinaiticus codex

Codex Sinaiticus (designated by the Hebrew letter Aleph or א) is one of the oldest and most complete manuscripts of the Christian Bible, dating to the fourth century AD. Written on vellum in Greek, it originally contained the entire Old Testament (Septuagint) and New Testament, along with the Epistle of Barnabas and the Shepherd of Hermas. It was discovered by the scholar Constantin von Tischendorf at Saint Catherine's Monastery on the Sinai peninsula in 1844–1859, a find of immense importance for New Testament textual criticism. Portions of the manuscript are now held at the British Library, the National Library of Russia, Leipzig University, and Saint Catherine's Monastery. Together with Codex Vaticanus (B), Sinaiticus is the primary witness to the Alexandrian text type and serves as a critical anchor for modern critical editions of the Greek New Testament.