‏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....

‏الزهد والرقائق‏ : Hadeeth No:7101 Simak b. Barb reported: I heard Nu'man deliver an address in which he said that (Hadrat) Umar made a mention of what had fallen to the lot of people out of the material world and he said: I saw Allaah's Messenger (sallAllaahu alayhi wa sallam) spend the whole day being upset because of hunger and he...