Ashur is the tenth day or tenth night of Moharram, which is the first month of the Arabic year. The word also signifies ten days or: ten nights. In ch. 89 of the Koran, God is introduced swearing by the ten nights.' The Mohammedans generally fast on this day for three reasons:
(1) because the ancient Arabians observed it as a fast-day before the time of Mohammed; (2) because on this day Noah left the ark; and (3) because on this day God pardoned the Ninevites.