Sahih Muslim · Hadith 1875

حدثنا يحيى بن يحيى، قال قرأت على مالك عن نافع، عن عبد الله بن عمر، أن رسول الله صلى الله عليه وسلم قال ‏"‏ إنما مثل صاحب القرآن كمثل الإبل المعقلة إن عاهد عليها أمسكها وإن أطلقها ذهبت ‏"‏ ‏.‏

This hadith has been narrated by Ibn 'Umar from the Apostle of Allah (may peace be upon him), but in the hadith transmited by Musa b. 'Uqba, this addition is made: " When one who had committed the Qur'an to memory (or who is familiar with it) gets up (for night prayer) and recites it night and day, it remains fresh in his mind, but if he does not get up (for prayer and thus does not recite it) he forgets it."

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).