According to Islamic theology, the first four successors of Prophet Muhammad were the "Rightly-Guided Caliphs" (Khulafaa-e-Rashidun). They were all Sahabahs who were extremely close to Muhammad, and are therefore considered by Muslims to be model Islamic leaders who ruled in accord with the Qur'an and Sunnah. The first four Caliphs were; Abu Bakr, Umar, Uthman, and Ali.
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- The Four Rightly-Guided Caliphs of Islam - Sunni Essentials, accessed October 2, 2010