The first four caliphs of Islam—Abu Bakr as-Siddiq, Umar ibn al-Khattab, Uthman ibn Affan, and Ali ibn Abi Talib (may Allah be pleased with them all)—are known as the Rightly Guided Caliphs (Al-Khulafa' al-Rashidun). These noble companions of the Prophet Muhammad ﷺ played a vital role in preserving and spreading the message of Islam after