Quran 57:6

He merges the night into day and the day into night. And He knows best what is ˹hidden˺ in the heart.Quran 57:6Surah   al-Hadid (The Iron)
This Surah takes its name from the Ayat, وَأَنزَلْنَا الْحَدِيدَ فِيهِ بَأْسٌ شَدِيدٌ “…And We sent down iron, wherein is great military might …” (57:25).
There are 29 Ayat in this Surah.
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یُولِجُ ٱلَّیۡلَ فِی ٱلنَّهَارِ وَیُولِجُ ٱلنَّهَارَ فِی ٱلَّیۡلِۚ وَهُوَ عَلِیمُۢ 
بِذَاتِ ٱلصُّدُورِ
The theme of this Surah is to exhort the Muslims to spend in the cause of God. At the most critical juncture of the history of Islam when it was engaged in a life and death struggle against Arab paganism, this Surah was revealed to persuade the Muslim’s to make monetary sacrifices in particular, and to make them realise that Islam did not merely consist in verbal affirmation and some outward practices but its essence and spirit is sincerity towards God and His Religion. The faith of the one who was devoid of this spirit and who regarded his own self and wealth as dearer to himself than God and His Religion, was hollow and therefore of little worth in the sight of God. For this object, first the attributes of God Almighty have been mentioned so that the listeners may fully realize as to Who is addressing them.
وہی 
رات کو دن میں 
اور 
دن کو رات میں 
داخل کرتا ہے، 
اور 
دلوں کے چھپے ہوئے 
راز تک جانتا ہے
Sections:
All knowledge and authority belongs to God. Have faith in Allah’s power, make sacrifice and give charity for the cause of truth.
Light and Life are for the Believers. The disbelievers walk in darkness. Warning to those who refuse to acknowledge Allah. Sincere in faith are those who are willing to sacrifice and help the poor and needy..
The life of this world is temporary. Compete with each other in doing good things to receive the eternal reward from Allah. Prophets were sent to establish justice with authority.
References to Prophets Noah, Ibrahim, and Jesus -peace be upon them all. All Prophets preached same message, but some of their followers went into extremes. The Christians thus invented monasticism for themselves. It was not commanded by God. The Believers are asked to have faith and walk in the light of Allah. The final success belongs to the Believers.

Quran 31:29

Do you not see that Allah causes the night to merge into the day and the day into the night, and has subjected the sun & the moon, each orbiting for an appointed term, and that Allah is All-Aware of what you do?Quran 31:29Surah   Luqman
This Surah is named after the wise person called, Luqman – who was well known amongst the Arabs for his wisdom.
It is the 31st Chapter of the Quran, There are 34 Verses in it.
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أَلَمۡ تَرَ أَنَّ ٱللَّهَ 
یُولِجُ ٱلَّیۡلَ فِی ٱلنَّهَارِ وَیُولِجُ ٱلنَّهَارَ فِی ٱلَّیۡلِ وَسَخَّرَ ٱلشَّمۡسَ وَٱلۡقَمَرَۖ كُلࣱّ یَجۡرِیۤ إِلَىٰۤ 
أَجَلࣲ مُّسَمࣰّى 
وَأَنَّ ٱللَّهَ بِمَا 
تَعۡمَلُونَ خَبِیر
In this Surah, Tawhid is emphasized and Shirk and its ideas are critically examined. It tells us that those who are following Shirk they are only blindly following their forefathers. The true wisdom is to believe in Allah. The advises of Luqman the wise are also given here to support the same principles.
کیا تم نے نہیں دیکھا کہ 
خدا ہی 
رات کو دن میں داخل کرتا ہے اور (وہی) 
دن کو رات میں داخل کرتا ہے اور اُسی نے 
سورج اور چاند کو (تمہارے) زیر فرمان کر رکھا ہے۔ 

ہر ایک ایک وقتِ مقرر تک چل رہا ہے 
اور یہ کہ خدا تمہارے 
سب اعمال سے خبردار ہے
Sections:
Qur’an is a book of guidance and mercy for all people.
The advises of Luqman the wise man.
Signs of tawhid in the heaven and earth. Shirk or polytheism has no basis.
In crisis people turn to the Real God. Let not the things of this world deceive you. All knowledge belongs to Allah.

Quran 55:19~21

This Surah takes its name after the name of Allah mentioned in the first Ayat, الرَّحْمَـٰنُ “The Most Merciful” (55:1). This is the only Surah of the Qur’an that begins with a name of Allah, in this case, ar-Rahman.
There are 78 Ayat in this Surah.
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مَرَجَ ٱلْبَحْرَيْنِ يَلْتَقِيَانِ
 ‎
‏بَيْنَهُمَا بَرْزَخٌۭ لَّا يَبْغِيَانِ
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‏فَبِأَىِّ ءَالَآءِ رَبِّكُمَا تُكَذِّبَانِ ‎
The Surah clearly indicates that Prophet Muhammad is Allah’s Prophet and Messenger for both human beings as well as Jinns. Allah’s many blessings and favors are mentioned in this Surah. Human beings and Jinn are invited to remember these favors and not to deny Allah’s blessings.
سورة الرَّحمٰن
دو سمندروں کو اس نے چھوڑ دیا کہ باہم مل جائیں
 
پھر بھی اُن کے درمیان ایک پردہ حائل ہے جس سے وہ تجاوز نہیں کرتے 

پس اے جن و انس، 
تم اپنے رب کی قدرت کے کن کن کرشموں کو جھٹلاؤ گے؟
Sections:
The various bounties of Allah.
Everything is finite, but Allah is infinite. Everyone depends on Allah. The warnings to the guilty.
The rewards for the righteous.