The Qur'ān (Arabic: al-qur’ān, literally "the recitation"; also called al-qur’ān al-karīm "The Noble Qur'ān"; also transliterated as Quran, Koran, and Al-Quran), is the central religious text of Islam. Muslims believe the Qur'ān, in its original Arabic, to be the literal word of God that was revealed to Muhammad over a period of twenty-three years until his death, and believe it to be God's final revelation to humanity. Muslims regard the Qur'ān as a continuation to other divine messages that have started with those revealed to Adam - the first prophet - and including Suhuf-i-Ibrahim (Scrolls of Abraham/Ibrahim), the Tawrat (Torah), the Zabur (Psalms), and the Injil (Gospel), in between. The aforementioned books are recognized in the Qur'ān, but directs Muslims to follow the Qur'ān--the last and final message, being completely untainted with God promising to protect it: "Verily We: It is We Who have sent down the Dhikr (i.e. the Quran) and surely, We will guard it (from corruption)".
The Qur'anic verses were originally memorized by Muhammad's companions as Muhammad recited them, with some being written down by one or more companions on whatever was at hand, from stones to pieces of bark. The collection of the Qur'ān compilation took place under the Caliph Abu Bakr, this task being led by Zayd ibn Thabit Al-Ansari. "The manuscript on which the Quran was collected, remained with Abu Bakr till Allah took him unto Him, and then with 'Umar till Allah took him unto Him, and finally it remained with Hafsa bint Umar (Umar's daughter)."