Codex Climaci rescriptus is a collective palimpsest manuscript consisting of several individual manuscripts underneath, Christian Palestinian Aramaic texts of the Old and New Testament as well as two apocryphal texts, including the Dormition of the Mother of God, and is known as Uncial 0250 with a Greek uncial text of the New Testament and overwritten by Syriac treatises of Johannes Climacus : the scala paradisi and the liber ad pastorem. Paleographically the Greek text has been assigned to the 7th or 8th century, and the Aramaic text to the 6th century. It originates from Saint Catherine's Monastery going by the New Finds of 1975. Formerly it was classified for CCR 5 and CCR 6 as lectionary manuscript, with Gregory giving the number ℓ 1561 to it.

Saint Catherine's Monastery, officially the Sacred Autonomous Royal Monastery of Saint Catherine of the Holy and God-Trodden Mount Sinai, is a Christian monastery located in the Sinai Peninsula of Egypt. Located at the foot of Mount Sinai, it was built between 548 and 565, and is the world's oldest continuously inhabited Christian monastery.