‏السلام : Hadeeth No:5422 'Abdullah reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: If you are three, two should not converse secretly to the exclusion of your companion for that hurts his feelings....

‏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....