‏البيوع : Hadeeth No:3640 Ibn Abbas (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 possession of it....

‏الصلاة : Hadeeth No:1580 Nu'man b. Salim reported with the same chain of transmitters: He who observed twelve voluntary rak'ahs, a house will be built for him in Paradise....