Tadabbur: The Requirement for Reflection and Logical Reasoning within the Quran.
Quran 47:24: Do they not then reflect on the Quran? Or are their hearts locked?

Reference: Quran: Muhammad 47:24

Quran: Muhammad 47:24
Translation: Dr. Mustafa Khattab, the Clear Quran

Do they not then reflect on the Quran? Or are there locks upon their hearts?

أَفَلَا يَتَدَبَّرُونَ ٱلْقُرْءَانَ أَمْ عَلَىٰ قُلُوبٍ أَقْفَالُهَآ

Reference  : Quran: Muhammad 47:24
 
Quran 38:29: The Quran was revealed so its verses may be contemplated, and the people of reason may learn from it.

Reference: Quran: Sad 38:29

Quran: Sad 38:29
Translation: Dr. Mustafa Khattab, the Clear Quran

˹This is˺ a blessed Book which We have revealed to you ˹O Prophet˺ so that they may contemplate its verses, and people of reason may be mindful.

 
Translation: Tafheem-ul-Quran - Abul Ala Maududi

This is the Blessed Book that We have revealed to you, (O Muhammad), that people with understanding may reflect over its verses and those with understanding derive a lesson.

كِتَبٌ أَنزَلْنَهُ إِلَيْكَ مُبَرَكٌۭ لِّيَدَّبَّرُوٓا۟ ءَايَتِهِۦ وَلِيَتَذَكَّرَ أُو۟لُوا۟ ٱلْأَلْبَبِ

Reference  : Quran: Sad 38:29
 
Quran 16:44: The Quran was revealed to the Prophet to explain to the people what was revealed, so that they may ponder.

Reference: Quran: An-Nahl 16:44

Quran: An-Nahl 16:44
Translation: Maarif-ul-Quran

(We sent them) with clear signs and scriptures. And We sent down the Message (The Qur'an) so that you explain to the people what has been revealed for them and so that they may ponder.

بِٱلْبَيِّنَتِ وَٱلزُّبُرِ ۗ وَأَنزَلْنَآ إِلَيْكَ ٱلذِّكْرَ لِتُبَيِّنَ لِلنَّاسِ مَا نُزِّلَ إِلَيْهِمْ وَلَعَلَّهُمْ يَتَفَكَّرُونَ ‎

Reference  : Quran: An-Nahl 16:44
 
Quran 3:7: Only the people of reason from among those with firm knowledge can understand the alagorical according to the clear verses of the Quran.

Reference: Quran: Ali 'Imran 3:7

Quran: Ali 'Imran 3:7
Translation: Dr. Mustafa Khattab, the Clear Quran

He is the One Who has revealed to you ˹O Prophet˺ the Book, of which some verses are precise—they are the foundation of the Book—while others are elusive. Those with deviant hearts follow the elusive verses seeking ˹to spread˺ doubt through their ˹false˺ interpretations—but none grasps their ˹full˺ meaning except Allah. As for those well-grounded in knowledge, they say, “We believe in this ˹Quran˺—it is all from our Lord.” But none will be mindful ˹of this˺ except people of reason.

 
Translation: Abridged Explanation of the Quran

O Prophet, He is the One Who revealed to you the Qur’ān, which contains verses with clear and unambiguous meaning, and these represent the majority of the Book and are the reference point when there is disagreement. It also contains other verses that may have more than one meaning and are puzzling for most people. Those who seek other than the truth leave the clear verses and focus on the unclear ones, trying to create doubts and mislead people, and interpret them to suit their corrupt views. No one knows the true meaning of such verses besides Allah. Those who are firm in knowledge say, ‘We have faith in the entire Qur’ān because it is all from Allah’. They interpret the unclear verses according to the clear ones. Only those who have sound minds pay attention to this.

هُوَ ٱلَّذِىٓ أَنزَلَ عَلَيْكَ ٱلْكِتَبَ مِنْهُ ءَايَتٌۭ مُّحْكَمَتٌ هُنَّ أُمُّ ٱلْكِتَبِ وَأُخَرُ مُتَشَبِهَتٌۭ ۖ فَأَمَّا ٱلَّذِينَ فِى قُلُوبِهِمْ زَيْغٌۭ فَيَتَّبِعُونَ مَا تَشَبَهَ مِنْهُ ٱبْتِغَآءَ ٱلْفِتْنَةِ وَٱبْتِغَآءَ تَأْوِيلِهِۦ ۗ وَمَا يَعْلَمُ تَأْوِيلَهُۥٓ إِلَّا ٱللَّهُ ۗ وَٱلرَّسِخُونَ فِى ٱلْعِلْمِ يَقُولُونَ ءَامَنَّا بِهِۦ كُلٌّۭ مِّنْ عِندِ رَبِّنَا ۗ وَمَا يَذَّكَّرُ إِلَّآ أُو۟لُوا۟ ٱلْأَلْبَبِ

Reference  : Quran: Ali 'Imran 3:7
 
Quran 62:5: Failing to heed to the Quran is akin to a donkey laden with books, deriving no understanding from that which it carries.
Quran: Al-Jumu'ah 62:5
Translation: Tafheem-ul-Quran - Abul Ala Maududi

The parable of those who were charged with the Torah and then they failed to live up to it is that of a donkey laden with books. Even more evil is the parable of the people who gave the lie to the Signs of Allah. Allah does not direct such wrong-doers to the Right Way.

مَثَلُ ٱلَّذِينَ حُمِّلُوا۟ ٱلتَّوْرَىٰةَ ثُمَّ لَمْ يَحْمِلُوهَا كَمَثَلِ ٱلْحِمَارِ يَحْمِلُ أَسْفَارًۢا ۚ بِئْسَ مَثَلُ ٱلْقَوْمِ ٱلَّذِينَ كَذَّبُوا۟ بِـَٔايَتِ ٱللَّهِ ۚ وَٱللَّهُ لَا يَهْدِى ٱلْقَوْمَ ٱلظَّلِمِينَ

Reference  : Quran: Al-Jumu'ah 62:5
 
Who are the "People of Firm Knowledge" possibly referred to in Quran 3:7?

Reference: Book 49, Hadith 120

Jami` at-Tirmidhi Book 49, Hadith 120
Narrated 'Ali:

that the Messenger of Allah (ﷺ) said: "I am the house of wisdom, and 'Ali is its door."

حَدَّثَنَا إِسْمَاعِيلُ بْنُ مُوسَى، حَدَّثَنَا مُحَمَّدُ بْنُ عُمَرَ بْنِ الرُّومِيِّ، حَدَّثَنَا شَرِيكٌ، عَنْ سَلَمَةَ بْنِ كُهَيْلٍ، عَنْ سُوَيْدِ بْنِ غَفَلَةَ، عَنِ الصُّنَابِحِيِّ، عَنْ عَلِيٍّ، رضى الله عنه قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ أَنَا دَارُ الْحِكْمَةِ وَعَلِيٌّ بَابُهَا ‏"

Note: Hafiz Ibn Hajar Al ‘Asqalani when asked regarding the authenticity of the Hadith, stated that the Hadith is not sahih nor is it fabricated (mawdu‘), rather it is sound (hasan).

1. ‘Allamah Suyuti 2. Hafiz ‘Alaee 3. ‘Allamah Sakhawi, and 4. Imam Zurqani have also agreed that the Hadith is sound.

Refer: Al La-Alil Manthurah, Hadith: 113-117, Al Maqasidul Hasanah, Hadith: 189, Mukhtasarul Maqasid, Hadith: 170, Ad Durarul Muntathirah, Hadith: 38, Al La-Alil Masnu’ah, vol. 1 pgs. 302-308, Tanzihush Shari’ah, vol. 1 pg. 377, Al Asrarul Marfu’ah, Hadith: 71, and Kashful Khafa, vol. 1 pg. 184