‏البيوع : Hadeeth No:3849 'Uthman b. 'Affan reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: Do not sell a dinar for two dinars and one dirham for two dirhams....

‏السلام : Hadeeth No:5428 A'isha reported that a Jew from among the Jews of Banu Zuraiq who was called Labid b. al-A'sam cast spell upon Allaah's Messenger (sallAllaahu alayhi wa sallam) with the result that he (under the influence of the spell) felt that he had been doing something whereas in fact he had not been doing that...