Islamic holy books are certain religious scriptures that are viewed by Muslims as having valid divine significance, in that they were authored by God (Allah) through a variety of prophets and messengers, including those who predate the Quran. Among the group of religious texts considered to be valid revelations, the three that are mentioned by name in the Quran are the Tawrat, received by prophets and messengers amongst the Children of Israel; the Zabur (Psalms), received by David; and the Gospel, received by Jesus. Additionally, the Quran mentions God's revealing of the Scrolls of Abraham and the Scrolls of Moses. Muslims hold the Quran, as it was revealed to Muhammad, to be God's final revelation to mankind, and therefore a completion and confirmation of previous scriptures, such as the Bible. Despite the primacy that Muslims place upon the Quran in this context, belief in the validity of earlier Abrahamic scriptures is one of the six Islamic articles of faith. However, for most self-identified Muslims, the level of this belief is restricted by the concept of . The Islamic methodology of (تفسير القرآن بالكتاب) refers to interpreting the Qur'an with/through the Bible. This approach adopts canonical Arabic versions of the Bible, including the Tawrat and the Injil, both to illuminate and to add exegetical depth to the reading of the Qur'an. Notable Muslim (commentators) of the Bible and Qur'an who weaved biblical texts together with Qur'anic ones include Abu al-Hakam Abd al-Salam bin al-Isbili of Al-Andalus and Ibrahim bin Umar bin Hasan al-Biqa'i. Quran The Quran is the central religious text of Islam, which Muslims believe to be a revelation from God (الله, Allah). The Quran is divided into chapters (surah), which are then divided into verses (ayah). Muslims believe the Quran was verbally revealed by Allah to Muhammad through the angel Gabriel (Jibril), gradually over a period of approximately 23 years, starting in late 609, when Muhammad was 39, and concluding in 632, the year of his death.