‏الصلاة : Hadeeth No:1070 Abu al-Tiyyah reported: I heard from Anas a narration like this from the Messenger of Allaah (sallAllaahu alayhi wa sallam)....

‏البر والصلة والآداب‏ : Hadeeth No:6283 Umm Darda' reported on the authority of Abu Darda' as saying: I heard Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: The invoker of curse would neither be witness nor intercessor on the Day of Resurrection....