Birth of Muhammad (Islamic prophet) and Jafar Sadiq (religious leader), Rabi I 17. This date in the Hijri calendar marks the birth of Muhammad ibn Abdullah, the founder of Islam, and Jafar Sadiq, a prominent Shia religious leader. In various Muslim communities, the day is observed with gatherings and events reflecting on the historical and religious roles of these two figures. In some countries, this date is recognized a public holiday or a day of religious commemoration.
