Sunan Ibn Majah

It was narrated that Zuhri heard Malik bin Aws bin Hadathan say:""I heard 'Umar say: ""The Messenger of Allah (ﷺ), said: 'Gold for silver is usury, unless it is exchanged on the spot.""' (Sahih) Abu Bakr bin Abu-Shaibah said: ""I heard sufyan saying: 'Gold for silver."" memorize (this)