Narrated Abu Bakra: Allah's Apostle said, "Don't sell gold for gold unless equal in weight, nor silver for silver unless equal in weight, but you could sell gold for silver or silver for gold as you like."
Hadith ReferenceSahih Bukhari / The Book of Sales (Bargains) / Hadith: 2175
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة