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