Muslims believe that the Quran was orally revealed by God to the final prophet, Muhammad, through the archangel Gabriel (Jibril),[16][17] incrementally over a period of some 23 years, beginning on 22 December 609 CE,[18] when Muhammad was 40; and concluding in 632, the year of his death.[11][19][20] Muslims regard the Quran as Muhammad's most important miracle; a proof of his prophethood;[21] and the culmination of a series of divine messages starting with those revealed to Adam, including the Tawrah (Torah), the Zabur ("Psalms") and the Injil ("Gospel"). The word Quran occurs some 70 times in