qqp question1: The first four Caliphs after the Prophet Muhammad are known as the Rightly Guided Caliphs (Rāshidūn); Abu Bakr, Umar, Uthman, and 'Ali. Does this suggest, according to Sunni sources, that these men did not make mistakes in their administrations? question2: How did the Caliphate dynasty expand after the death of Mohammad in 632?