‏الصلاة : Hadeeth No:1726 Ibn Mas'ud reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: Wretched is the man who says: I forgot such and such a sura, or I forget such and such a verse, but he has been made to forget....

‏الصلاة : Hadeeth No:1813 'A'isha reported that 'Umar misconstrued the fact that the Messenger of Allaah (sallAllaahu alayhi wa sallam) had prohibited the observance of prayer at the time of the rising sun and at the time of its setting....