31:29
أَلَمْ تَرَ أَنَّ ٱللَّهَ يُولِجُ ٱلَّيْلَ فِى ٱلنَّهَارِ وَيُولِجُ ٱلنَّهَارَ فِى ٱلَّيْلِ وَسَخَّرَ ٱلشَّمْسَ وَٱلْقَمَرَ كُلٌّۭ يَجْرِىٓ إِلَىٰٓ أَجَلٍۢ مُّسَمًّۭى وَأَنَّ ٱللَّهَ بِمَا تَعْمَلُونَ خَبِيرٌۭ
Do you not see that Allah causes the night to enter the day and causes the day to enter the night and has subjected the sun and the moon, each running [its course] for a specified term, and that Allah, with whatever you do, is Acquainted?
Translation · Saheeh International
Tafsir
Ibn Kathīr (abridged)
The Might and Power of Allah Allah tells us that He
يُولِجُ الَّيْلَ فِى النَّهَارِ
(merges the night into the day,) meaning, He takes from the night and adds to the day, so that the day becomes longer and the night shorter, which is what happens in summer when the days are longest; then the day starts to become shorter and the night longer, which is what happens in winter.
وَسَخَّرَ الشَّمْسَ وَالْقَمَرَ كُلٌّ يَجْرِى إِلَى أَجَلٍ مُّسَمًّى
(and has subjected the sun and the moon, each running its course for a term appointed;) It was said that this means, each runs within its set limits, or it means until the Day of Resurrection; both meanings are correct. The first view is supported by the Hadith of Abu Dharr, may Allah be pleased with him, in the Two Sahihs, according to which the Messenger of Allah ﷺ said:
«يَا أَبَا ذَرَ أَتَدْرِي أَيْنَ تَذْهَبُ هَذِهِ الشَّمْسُ؟»
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