Sahih Muslim Hadith 4087

I asked Ibn Umar and Ibn Abbas (رضی اللہ عنہ) about the conversion of gold with gold but they did not find any harm in that. I was sitting in the company of Abd Sa'id al-Khudri (رضی اللہ عنہ) and asked him about this exchange, and he said: Whatever is addition is an' interest. I refused to accept it on account of their statement (statement of Ibn 'Abbas and Ibn 'Umar رضی اللہ عنہ ). He said: I am not narrating to you except what I heard from Allah's Messenger ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌ ). There came to him the owner of a date-palm with one sa' of fine dates, and the dates of Allah's Apostle ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌ ) were of that colour. Allah's Apostle ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌ ) said to him: Where did you get these dates? I went with two sa's of (inferior dates) and bought one sa' of (these fine dates), for that is the prevailing price (of inferior dates) in the market and that is the price (of the fine quality of dates in the market), whereupon Allah's Messenger ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌) said: Woe be upon you! You have dealt in interest, when you decide to do it (i.e. exchange superior quality of dates for inferior quality); so you should sell your dates for another commodity (or currency) and then with the help of that commodity buy the dates you like. Abu Sa'ad رضی اللہ عنہ said: When dates are exchanged for dates (with different qualities) there is the possibility (of the element of) interest (creeping into that) or when gold is exchanged for gold having different qualities. I subsequently came to Ibn 'Umar رضی اللہ عنہ and he forbade me (to do it), but I did not come to Ibn 'Abbas (رضی اللہ عنہ). He (the narrator) said: Abu as-Sahba' narrated to me: He asked Ibn Abbas (رضی اللہ عنہ) in Mecca, and he too disapproved of it.