‏البيوع : Hadeeth No:3647 Ibn 'Umar (Allaah be pleased with them) reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: He who bought foodgrain should not sell it until he had taken full possession of it (after measuring it)....

‏الإمارة : Hadeeth No:4492 It has been reported on the authority of Abu Dharr that the Messenger of of Allaah (sallAllaahu alayhi wa sallam) said: Abu Dharr, I find that thou art weak and I like for thee what I like for myself. Do not rule over (even) two persons and do not manage the property of an orphan....