‏البيوع : Hadeeth No:3877 Ubaidullah b. Abu Yazid heard Ibn 'Abbas (Allaah be pleased with them) as saying: Usama b. Zaid reported Allaah's Prophet (sallAllaahu alayhi wa sallam) as saying: There can be an element of interest in credit (when the payment is not equal)....

‏الإمارة : Hadeeth No:4473 It has been narrarted on the authority of Abu Huraira that the Messenger of Allaah (sallAllaahu alayhi wa sallam) said: People are subservient to the Quraish: the Muslims among them being subservient to the Muslims among them, and the disbelievers among the people being subservient to the disbelieve...