‏البيوع : Hadeeth No:3848 Abu Sa'id al-Khudri (Allaah be pleased with him) reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: Do not sell gold for gold and silver for silver weight for weight or of the same quality....

‏فضائل الصحابة‏ : Hadeeth No:6079 'A'isha reported that Hassin said: Allaah's Messenger, permit me to write satire against Abu Sufyan, whereupon he said: How can it be because I am also related to him? Thereupon he (Hassan) said: By Him Who has honoured you. I shall draw you out from them (their family) just as hair is drawn out fro...