Sahih Muslim, 1841

Abdullah reported Allah's Messenger (ﷺ) as saying:What a wretched person is he amongst them who says: I have forgotten such and such a verse. (He should instead of using this expression say): I have been made to forget it. Try to remember the Qur'an for it is more apt to escape from men's minds than a hobbled camel

Rapporté par Abdullah رضي الله عنه : Le Messager d’Allah ﷺ a dit : « Quel malheureux est celui qui dit : “J’ai oublié tel verset.” (Au lieu de cela, il devrait dire :) “On m’a fait oublier ce verset.” Efforcez-vous de retenir le Coran, car il s’échappe plus facilement de la mémoire que le chameau attaché. »