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).
English reference: Vol. 3, Book 12, Hadith 2259
Arabic reference: Book 12, Hadith 2344