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The word 'Caliph' is the English form of the Arabic word 'Khalifa,' which is short for Khalifatu Rasulil-lah. The latter expression means Successor to the Messenger of God, the Holy Prophet Muhammad (may Peace Be Upon Him). The title 'Khalifatu Rasulil-lah'. was first used for Abu Bakr, who was elected head of the Muslim community after the death of the Prophet.