‏البيوع : Hadeeth No:3644 Ibn 'Umar (Allaah be pleased with them) reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: He who buys foodgrain should not sell it until he has taken full possession of it....

‏السلام : Hadeeth No:5513 Abu Huraira reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: There is no transitive disease, no huma, no star promising rain, no safar....