the Holy Qur'an

They ask thee concerning the New Moons. Say: They are but signs to mark fixed periods of time in (the affairs of) men, and for Pilgrimage. It is no virtue if ye enter your houses from the back: It is virtue if ye fear God. Enter houses through the proper doors: And fear God: That ye may prosper. (2:189)

It is He Who made the sun to be a shining glory and the moon to be a light (of beauty), and measured out stages for her; that ye might know the number of years and the count (of time). Nowise did God create this but in truth and righteousness. (Thus) doth He explain His Signs in detail, for those who understand. (10:5)

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