‏الإمارة : Hadeeth No:4604 It has been narrated on the authority of Abdullah b. 'Umar who said: We used to take oath to the Messenger of Allaah (sallAllaahu alayhi wa sallam) that we would listen to and obey his orders. He would tell us (to say in the oath): As far as it lies in my power....

‏البيوع : Hadeeth No:3611 A hadith like this has been narrated on the authority of Abu Huraira (Allaah be pleased with him) through another chain of transmitters....