"It is He who made for you the night to rest therein," meaning: for you to settle therein from fatigue, "and the day, giving sight," meaning: luminous, so that you may seek your livelihoods therein.
Muhammad said: It was said: "giving sight" means: [a day] in which things are seen; just as you say: a sleeping night.
﴿هُوَ الَّذِي جَعَلَ لَكُمُ اللَّيْلَ لتسكنوا فِيهِ﴾ يَعْنِي: لِتَسْتَقِرُّوا فِيهِ مِنَ النَّصَبِ ﴿وَالنَّهَار مبصرا﴾ أَيْ: مُنِيرًا لِتَبْتَغُوا فِيهِ مَعَايِشَكُمْ.
قَالَ محمدٌ: قيل: ﴿مبصرا﴾ يَعْنِي: مُبْصَرًا فِيهِ؛ كَمَا تَقُولُ: ليلٌ نَائِمٌ،