Yahya related to me from Malik from Nafi from Abdullah ibn Umar that the Messenger of Allah ﷺ said, "A man who knows the Qur'an well is like a man who has a hobbled camel. If he takes care of it, he keeps it, and if he lets it go, it gets away."
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِنَّمَا مَثَلُ صَاحِبِ الْقُرْآنِ كَمَثَلِ صَاحِبِ الإِبِلِ الْمُعَقَّلَةِ إِنْ عَاهَدَ عَلَيْهَا أَمْسَكَهَا وَإِنْ أَطْلَقَهَا ذَهَبَتْ