Al-Isra 17:12

<h2>The Night and Day are Signs of the Great Power of Allah</h2><p>Allah reminds us of the great signs that He created, including the alternation of the night and day, so that people may rest at night, and go out and earn a living, do their work, and travel during the day, and so that they may know the number of days, weeks, months and years, so they will know the appointed times for paying debts, doing acts of worship, dealing with transactions, paying rents and so on. Allah says:</p><div class="arabic uthmani">لِتَبْتَغُواْ فَضْلاً مِّن رَّبِّكُمْ</div><p>(that you may seek bounty from your Lord,) meaning, in your living and travels etc.</p><div class="arabic uthmani">وَلِتَعْلَمُواْ عَدَدَ السِّنِينَ وَالْحِسَابَ</div><p>(and that you may know the number of the years and to count.) If time stood still and never changed, we would not know any of these things, as Allah says:</p><div class="arabic uthmani">قُلْ أَرَأَيْتُمْ إِن جَعَلَ اللَّهُ عَلَيْكُمُ الَّيْلَ سَرْمَداً إِلَى يَوْمِ الْقِيَـمَةِ مَنْ إِلَـهٌ غَيْرُ اللَّهِ يَأْتِيكُمْ بِضِيَآءٍ أَفَلاَ تَسْمَعُونَ - قُلْ أَرَءَيْتُمْ إِن جَعَلَ اللَّهُ عَلَيْكُمُ النَّهَارَ سَرْمَداً إِلَى يَوْمِ الْقِيَـمَةِ مَنْ إِلَـهٌ غَيْرُ اللَّهِ يَأْتِيكُمْ بِلَيْلٍ تَسْكُنُونَ فِيهِ أَفلاَ تُبْصِرُونَ - وَمِن رَّحْمَتِهِ جَعَلَ لَكُمُ الَّيْلَ وَالنَّهَارَ لِتَسْكُنُواْ فِيهِ وَلِتَبتَغُواْ مِن فَضْلِهِ وَلَعَلَّكُمْ تَشْكُرُونَ </div><p>(Say: …

And We appoint the night and the day two portents. Then We make dark the portent of the night, and We make the portent of the day sight-giving, that ye may seek bounty from your Lord, and that ye may know the computation of the years, and the reckoning; and everything have We expounded with a clear expounding.

We have made the Night and the Day as two (of Our) Signs: the Sign of the Night have We obscured, while the Sign of the Day We have made to enlighten you; that ye may seek bounty from your Lord, and that ye may know the number and count of the years: all things have We explained in detail.

And We have appointed the night and the day as two Ayat (signs etc.). Then, We have made dark the sign of the night while We have made the sign of day illuminating, that you may seek bounty from your Lord, and that you may know the number of the years and the reckoning. And We have explained everything (in detail) with full explanation.

We have made the night and the day two wonders. We erased the wonder of the night, and made the wonder of the day revealing, that you may seek bounty from your Lord, and know the number of years, and the calculation. We have explained all things in detail.