‏الأيمان : Hadeeth No:4108 Abu Huraira reported Allaah's Prophet (sallAllaahu alayhi wa sallam) as saying: In case the slave is owned by two persons, and one of them emancipates him, he will guarantee (his full freedom)....

‏البيوع : Hadeeth No:3625 Abdullah (Allaah be pleased with him) reported Allaah's Prophet (sallAllaahu alayhi wa sallam) as saying: Do not meet the traders (in the way)....