Some Ans. Questions 1908 by -'Abdu'l-Bahá- 1 Para

To conclude, let us now explain the date of the manifestation of Baha'u'llah from the Bible. The date of Baha'u'llah is calculated according to lunar years from the mission and the Hejira of Muhammad; for in the religion of Muhammad the lunar year is in use, as also it is the lunar year which is employed concerning all commands of worship (43:1)

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