Muhammad's Prophethood (Rajab 27), Rajab 27 is recognized the day when Muhammad ibn Abdullah was chosen a prophet, around 13 years before the Hijra. This event took place in the Cave of Hira and marks the beginning of the revelation and the start of the Islamic call. In various Muslim communities, this day is observed with religious gatherings and commemorations. The significance of this event in Islamic history lies in its role the starting point of Muhammad's prophethood and the beginning of social and religious changes in the Arabian Peninsula.