‏الصلاة : Hadeeth No:1572 'A'isha reported: I have never seen the Messenger of Allaah (sallAllaahu alayhi wa sallam) hastening as much in observing supererogatory as two rak'ahs before the (Fard) of the dawn prayer....

‏الفضائل : Hadeeth No:5847 This hadith has been narrated on the authority of Abu Huraira through another chain of transmitters but with a slight variation of wording....