Silver for gold is Riba (usury) unless exchanged on the spot; wheat for wheat is Riba unless exchanged on the spot; barley for barley is Riba unless exchanged on the spot; and dates for dates is Riba unless exchanged on the spot
Mālik ibn Aws ibn al-Hadathān reported: I came saying: Who will exchange the dirhams? Talhah ibn ‘Ubaydullāh, who was in the company of ‘Umar ibn al-Khattāb (may Allah be pleased with both of them), said: Show us your gold, then come to us when our servant comes to give…

