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The inscription is the earliest dated Arabic inscription so far located in the world. It mentions the date of the death of the second Caliph of Islam, Omar bin al-Khattab who died on the last night of the month of Dul-Hajj of the year 23 Hegrah, and was buried next day on the first day of Muharram of the new year 24 Hegrah (corresponding to 644 AD).