we have made night and day as two signs. we made the sign of the night devoid of light and made the sign of the day radiant that you may seek the bounty of your lord and know the computation of years and numbers. thus we have expounded everything in detail to keep everything distinct from the other.
وجعلنا الليل والنهار آيتين فمحونا آية الليل وجعلنا آية النهار مبصرة لتبتغوا فضلا من ربكم ولتعلموا عدد السنين والحساب وكل شيء فصلناه تفصيلا