61تَبَارَكَ ٱلَّذِى جَعَلَ فِى ٱلسَّمَآءِ بُرُوجًا وَجَعَلَ فِيهَا سِرَٰجًا وَقَمَرًا مُّنِيرًا
62وَهُوَ ٱلَّذِى جَعَلَ ٱلَّيْلَ وَٱلنَّهَارَ خِلْفَةً لِّمَنْ أَرَادَ أَن يَذَّكَّرَ أَوْ أَرَادَ شُكُورًا
[61-62] Highly blessed is He, Who has made fortified spheres75 in the heavens and has set in it a "lamp"76 and a shining moon. He it is Who caused the night and the day to succeed each other so that everyone who desires may learn a lesson or become grateful.77
75See E.N.'s 8 to 12 of Al Hijr.
76That is, the sun, as mentioned clearly in Surah Nuh: 16: "... and made the sun a lamp."
77The observation and deep consideration of the wonderful phenomenon of the alternation of the day and night is a proof of Tauhid and His Providence so that man may feel grateful to Him and prostrate himself before Him in all humility.