Question Summary:
Is it compulsory to revise the Qur’an if I memorized it when I was not Baligh?

Question Detail:

 
 If quran was memorized before becoming baaligh, is it compulsary to revise it? I memorized quran when I was younger and not baaligh, so I plan on reviewing this summer iA, but while I am not reviewing it will I be sinning?

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
A person who memorizes the Qur’an has been bestowed with a great bounty of Allah. Consider the following Ahadith:
عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏ 
‏ يُقَالُ لِصَاحِبِ الْقُرْآنِ اقْرَأْ وَارْتَقِ وَرَتِّلْ كَمَا كُنْتَ تُرَتِّلُ فِي الدُّنْيَا فَإِنَّ مَنْزِلَتَكَ عِنْدَ آخِرِ آيَةٍ تَقْرَأُ بِهَا
Translation: Abdullah ibn Amr (Radhiyallahu anhu) narrates that Nabi (ﷺ) is reported to have mentioned: “It will be said to the one who memorized the Qur'an 'Recite, and rise up, recite melodiously as you would recite melodiously in the world. For indeed your rank (abode) shall be at the last Ayah you recited. [1] (Abu Dawud)
وعن عثمان بن عفان رضي الله عنه قال‏:‏ قال رسول الله صلى الله عليه وسلم ‏:‏ ‏ "‏خيركم من تعلم القرآن وعلمه‏"‏
Translation: Uthman ibn Affan (Radhiyallahu Anhu) narrates that Nabi (ﷺ) is reported to have mentioned: “The best amongst you is he who learns the Qur’an and teaches it.[2] (Bukhari)
عَنْ سَهْلِ بْنِ مُعَاذٍ الْجُهَنِيِّ، عَنْ أَبِيهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ مَنْ قَرَأَ الْقُرْآنَ وَعَمِلَ بِمَا فِيهِ أُلْبِسَ وَالِدَاهُ تَاجًا يَوْمَ الْقِيَامَةِ ضَوْؤُهُ أَحْسَنُ مِنْ ضَوْءِ الشَّمْسِ فِي بُيُوتِ الدُّنْيَا لَوْ كَانَتْ فِيكُمْ فَمَا ظَنُّكُمْ بِالَّذِي عَمِلَ بِهَذَا ‏"
Translation: Mua’dh Al-Juhani (Radhiyallahu Anhu) narrates that Nabi (ﷺ) is reported to have mentioned: “If anyone recites the Qur'an and acts according to its content, on the Day of Judgement his parents will be given to wear a crown whose light is better than the light of the sun in the houses of this world if it were among you. So what do you think of him who acts according to it?[3]  (Abu Dawud)
A position also comes with responsibilities. A Hafidh is duty bound by Allah to preserve the Qur’an in his memory. The Qur’an is the speech (Kalaam) of Allah and a sensitive guest. If one pays attention to this guest, it will remain. If one neglects this guest, it would go away and deprive one of Allah’s words being in his heart.
 
 
Consider the following Ahadith:
عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ 
إِنَّمَا مَثَلُ صَاحِبِ الْقُرْآنِ كَمَثَلِ صَاحِبِ الإِبِلِ الْمُعَقَّلَةِ إِنْ عَاهَدَ عَلَيْهَا أَمْسَكَهَا وَإِنْ أَطْلَقَهَا ذَهَبَت
Translation: Ibn Umar (Radhiyallahu Anhu) narrates that Nabi (ﷺ) is reported to have said: “The example of the person who knows the Qur'an by heart is like the owner of tied camels. If he keeps them tied, he will control them, but if he releases them, they will run away.”[4] ) Bukhari)
عن عَائِشَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏ "‏ مَثَلُ الَّذِي يَقْرَأُ الْقُرْآنَ وَهْوَ حَافِظٌ لَهُ مَعَ السَّفَرَةِ الْكِرَامِ الْبَرَرَةِ، وَمَثَلُ الَّذِي يَقْرَأُ الْقُرْآنَ وَهْوَ يَتَعَاهَدُهُ وَهْوَ عَلَيْهِ شَدِيدٌ، فَلَهُ أَجْرَانِ
Translation: A’isha (Radhiyallahu Anha) narrates that Nabi (ﷺ) is reported to have said: "Such a person who recites the Qur'an and masters it by heart, will be with the noble righteous scribe. And such a person who exerts himself to learn the Qur'an by heart, and recites it with great difficulty, will have a double reward."[5] (Bukhari)
أَبُو أُمَامَةَ، الْبَاهِلِيُّ قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏ "‏ اقْرَءُوا الْقُرْآنَ فَإِنَّهُ يَأْتِي يَوْمَ الْقِيَامَةِ شَفِيعًا لأَصْحَابِهِ
Translation: Abu Umamah Al-Bahiliy (Radhiyallahu Anhu) narrates that I heard Nabi (ﷺ) saying: “Recite the Qur'an, for on the Day of Resurrection it will come as an intercessor for those who recite It”[6]  (Muslim)
If you have a valuable item, you would ensure looking after it and maintaining it. If you don’t, the value of the item will decrease and you will lose out.
It was the noble habit of Sahaba to recite the Qur’an daily. In fact the Rasul of Allah (ﷺ) being the recipient of the Wahi (divine revelation of the Qur’an) and who has been promised that the Qur’an would be preserved[7] in him would revise the Qur’an with Jibra’eel (Alaihis Salaam).[8]
 
And Allah Ta’āla Knows Best
Abdullah ibn Mohammed Aijaz
Student Darul Iftaa
Baltimore, USA 
Checked and Approved by,
Mufti Ebrahim Desai.