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Muslims believe that the Quran was verbally revealed from God to Muhammad through the angel Gabriel (Jibril), gradually over a period of approximately 23 years, beginning on 22 December 609 CE, when Muhammad was 40, and concluding in 632 CE, the year of his death. Abdullah Ibn SaLAM … (ISLAM). In 622AD the point where Muhammad leaves Mecca for Medina Abdullah m, son of Salam, an allegedly disenfranchised Pharisee (Persian) Rabbi became a companion of the prophet Muhammad, and was a rabbi before converting to Islam. He participated in the conquest of Syria and Palestine, but died in Medina.