‏الصلاة : Hadeeth No:1536 Ibn Buhaina reported: The dawn prayer had commenced when the Messen- ger of Allaah (sallAllaahu alayhi wa sallam) saw a person observing prayer, whereas the Mu'adhdhin had pronounced the Iqama. Upon this he (the Prophet) remarked: Do you say four (rak'ahs) of Fard in the dawn prayer?...

‏الحج : Hadeeth No:3009 This hadith is narrated on the authority of Hisham with the same chain of transmitters....