‏البيوع : Hadeeth No:3880 'Abdullah (b. Mas'ud) (Allaah be pleased with him) said that Allaah's Messenger (sallAllaahu alayhi wa sallam) cursed the one who accepted interest and the one who paid it I asked about the one who recorded it, and two witnesses to it. He (the narrator) said: We narrate what we have heard....

‏البر والصلة والآداب‏ : Hadeeth No:6263 Abu Huraira reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: When two persons indulge in hurling (abuses) upon one another, it would be the first one who would be the sinner so long as the oppressed does not transgress the limits....