Abu Hurairah (RA) reported Allah's Messenger ( صلی اللہ علیہ وسلم ) as saying: May Allah destroy the Jews for Allah forbade the use of fat for them, but they sold it and made use of its price.

Abu Sa'id al-Khudri reported Allah's Messenger ( صلی اللہ علیہ وسلم ) as saying: Do not sell gold for gold, except like for like, and don't increase something of it upon something; and don't sell silver unless like for like, and don't increase some thing of it upon something, and do not sell for ready money something to be given later.