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15 ore fa · Umar ibn al-Khattab, a prominent companion of Muhammad, nominated Abu Bakr, Muhammad's friend and collaborator. With additional support, Abu Bakr was confirmed as the first caliph . This choice was disputed by some of Muhammad's companions, who held that Ali ibn Abi Talib, his cousin and son-in-law, had been designated the successor by Muhammad at Ghadir Khumm .
