Quran 18:54

We have surely set forth in this Quran every ˹kind of˺ lesson for people, but humankind is the most argumentative of all beings.Quran 18:54 Surah al-Kahf (The Cave)
Al-Kahf (Arabic: الكهف, al-kahf; meaning: The Cave) is the 18th chapter (sūrah) of the Quran with 110 verses (āyāt).
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وَلَقَدۡ صَرَّفۡنَا فِی هَـٰذَا ٱلۡقُرۡءَانِ لِلنَّاسِ مِن كُلِّ مَثَلࣲۚ 
وَكَانَ ٱلۡإِنسَـٰنُ أَكۡثَرَ شَیۡءࣲ جَدَلࣰ
There is a hadith in Sahih Muslim that states that Muhammad said (Concerning The False Messiah, Al-Masih ad-Dajjal):
“He who amongst you would survive to see him should recite over him the opening verses of Sura Kahf”
— Sahih Muslim, Book 41, Number 7015
اور ہم نے اس قرآن میں لوگوں (کے سمجھانے) کے لئے طرح طرح کی مثالیں بیان فرمائی ہیں۔ لیکن انسان سب چیزوں سے بڑھ کر جھگڑالو ہے
This Surah was sent down in answer to three questions which the polytheists of Makkah in consultation with the People of the Book (the Jews and the Christians) put to the Prophet. These were:
Who were ‘The Sleepers of the Cave?’
What is the real story of Khidr?
What do you know about Dhul-Qarnain?
These three questions and their stories related to the history of the Christians and the Jews and were unknown in the Arabian Peninsula (Hijaz), so they were being used to test the divine knowledge revealed to the Prophet. However, God informed the Prophet of the complete answer to these questions and also employed the stories in the conflict between Islam and unbelief.
The questioners were told that the ‘Sleepers of the Cave’ believed in the same doctrine of Monotheism (Tawhid) which was being put forward in the Qur’an and that their condition was similar to that of the persecuted Muslims of Makkah. Also, the persecutors of the Sleepers of the Cave behaved in the same way as the disbelievers of Quraysh towards the Muslims. This particular story was a warning to the chiefs of Makkah, who were persecuting the small newly formed Muslim community. Additionally, the Prophet was instructed not to compromise with the persecutors nor consider the chiefs to be more important than his own followers. Likewise, the chiefs too were admonished and informed not to be distracted by the temporary life of this world but seek the eternal life of the hereafter.

Quran 9:115

And Allah will never lead a people astray after He has guided them, until He makes clear to them what they should avoid. Surely, Allah is All-Knower of everything.Quran 9:115 (Surah at-Taubah)
The name of the surah, at-Taubah is derived from ت و ب and it occurs 87 times in the Quran. Interestingly, this surah has the highest usage of the words derived from ت و ب compared to all other surahs – it is used 17 times.
In Ayat 118, occurs the case of the three companions whom Allah turned to and accepted their tawbah to Him – those who had abstained from joining the Jihad at the Battle of Tabuk.
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وَمَا كَانَ ٱللَّهُ لِیُضِلَّ قَوۡمَۢا بَعۡدَ إِذۡ هَدَىٰهُمۡ 
حَتَّىٰ یُبَیِّنَ لَهُم مَّا یَتَّقُونَۚ
 إِنَّ ٱللَّهَ بِكُلِّ شَیۡءٍ عَلِیمٌ
This is the only Sūrah of the Qur’ān to which ‘In the Name of God, Most Gracious Most Merciful’ is not prefixed. Though the commentators have given different reasons for this, the correct one that which has been given by Imām Razi: namely this is because the Prophet himself did not dictate it at the beginning of the Sūrah. Therefore the Companions did not prefix it and their successors followed them. This is a further proof of the fact that utmost care has been taken to keep the Qur’ān intact so that it should remain in its complete and original form.
اور خدا ایسا نہیں 
کہ کسی قوم کو 
ہدایت دینے کے بعد 
گمراہ کر دے 
جب تک کہ ان کو وہ چیز نہ بتا دے جس سے وہ پرہیز کریں۔ 
بےشک خدا ہر چیز سے واقف ہے
The basic subjects of the Surah are: The non-believers who broke their treaties, Muslims have no obligation to honor treaties with them. Muslims must protect themselves from hypocrisy, weak faith and negligence. Battle of Tabuk and its lessons.