Ata' bin Abu Rabah reported: Abu Sa'id al-Khudri (RA) met Ibn 'Abbas (RA) and said to him: What do you say in regard to the conversion (of commodities or money) did you hear it from Allah's Messenger ( صلی اللہ علیہ وسلم ) , or is it something which you found In Allah's Book, Majestic and Glorious? Thereupon Ibn Abbas (RA) (Allah be pleated with them) said: I don't say that. So far at Allah's Massenger ( صلی اللہ علیہ وسلم ) is concerned, you know him better, and to far as the Book of Allah to concerned, I do not know it (more than you do), but 'Usama bin Zaid (RA) narrated to me Allah's Messenger ( صلی اللہ علیہ وسلم ) as having said this: Beware, there can be an element of interest in credit.