The Messenger of Allah ﷺ said: "The one who learns the Quran is like the owner of a hobbled camel. If he pays attention to it, he will keep it, but if he releases it, it will go away." (Using translation from Nasāʾī 942)
أَنَّ رَسُولَ اللهِ ﷺ قَالَ مَثَلُ صَاحِبِ الْقُرْآنِ كَمَثَلِ صَاحِبِ الْإِبِلِ الْمُعَقَّلَةِ إِنْ عَاهَدَ عَلَيْهَا أَمْسَكَهَا وَإِنْ أَطْلَقَهَا ذَهَبَتْ