Abd Allah ibn Abi Quhafa (23 August 634), better known by his kunya Abu Bakr, was a senior companion, the closest friend, and father-in-law of Muhammad. He served as the first caliph of the Rashidun Caliphate, ruling from 632 until his death in 634. Abu Bakr was granted the honorific title aṣ-Ṣiddīq (lit. the Veracious) by Muhammad, a designation that continues to be used by Sunni Muslims to this day. Wikipedia
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