The birthday of Muhammad al-Mahdi is observed as a public holiday in Iran on February 3 every year, corresponding to the 15th day of the Islamic month of Sha'ban. Muhammad al-Mahdi is revered by Shia Muslims as the final Imam of the Twelve Imams and is believed to be the prophesied savior of humankind in Islamic eschatology. His birthday celebration reflects the significance of his role in bringing peace and justice to the world, as he is expected to reappear alongside Isa (Jesus Christ) before the Day of Judgment. Shia Muslims commemorate this day with various religious activities, emphasizing their respect for al-Mahdi, who they believe did not die but is in occultation, concealed by Allah. The observance of this holiday highlights the importance of al-Mahdi in Shia Islam, which is the official state religion of Iran.