وَعَنْ سَعْدِ بْنِ عُبَادَةَ
قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَا من امْرِئٍ يَقْرَأُ الْقُرْآنَ ثُمَّ يَنْسَاهُ إِلَّا لَقِيَ اللَّهَ يَوْمَ الْقِيَامَةِ أَجْذَمَ»
Sad ibn Ubada reported God’s messenger as saying, “Every man who recites the Qur’an and then forgets it* will meet God on the day of resurrection in a maimed condition.” *This has been explained as referring to one who has learned the Qur’an by heart and later forgets it, or neglects to recite it. Abu Dawud and Darimi transmitted it.
Mishkat al-Masabih 2104, Book 9, The Excellent Qualities of the Qur'an, Hadith 90. 1 min read