Codex of Ubayy ibn Ka'b

The codex of Ubayy ibn Ka'b is a mushaf of the Quran that differs from the Uthmanic codex and is attributed to Ubayy ibn Ka'b, a companion of Muhammad. The codices of Ubayy and Uthman differ on point of several textual variants between the two, but more importantly, Ubayy's codex possesses a total of 116 surahs, whereas the codex of Uthman possesses 114. The surahs absent from the Uthmanic codex, but present in that of Ubayy, are Al-Khalʿ (Surah 115) and Al-Ḥafd (Surah 116). These continued to be seen as authoritative and Quranic by several scholars through the eighth century, and evidence for the transmission of the codex is available until the tenth or eleventh centuries. A copy of the codex of Ubayy is unavailable in any extant manuscript, although its historicity is accepted. Islamic scholars documented the text of Ubayy's two unique surahs in addition to the textual variants that distinguished the codex of Ubayy from that of Uthman.