‏الأيمان : Hadeeth No:4064 Abu Haraira reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: Your oath should be about something regarding which your companion will believe you. 'Amr said: By which your companion will believe you....

‏الإيمان : Hadeeth No:103 It is narrated on the authority of Jarir that he observed: I owed allegiance to the Prophet of Allaah (may peace and blessings be upon him) on hearing ( is commands) and obeying (them) and the Prophet) instructed me (to act) as lay in my power, and sincerity and goodwill for every Muslim....