Some Ans. Questions 2014 by -'Abdu'l-Bahá- 1 Para

Let us now establish the date of the advent of Baha'u'llah from the Torah. This date is calculated in lunar years from the revelation of the mission and the emigration of Muhammad. For in the religion of Muhammad the lunar calendar is used, and all the ordinances regarding religious observances have been expressed in terms of that calendar (10:18)

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