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ʿUmar ibn al-Khaṭṭāb was the second Rashidun caliph, ruling from August 634 until his assassination in 644. He succeeded Abu Bakr as the second caliph of the Rashidun Caliphate on 23 August 634. Umar was a senior companion and father-in-law of the Islamic prophet Muhammad. He was also an expert Muslim jurist known for his pious and just nature, which earned him the epithet al-Fārūq.   Wikipedia

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