Sahih al-Bukhari
Sahih al-Bukhari 2182
حَدَّثَنَا عِمْرَانُ بْنُ مَيْسَرَةَ، حَدَّثَنَا عَبَّادُ بْنُ الْعَوَّامِ، أَخْبَرَنَا يَحْيَى بْنُ أَبِي إِسْحَاقَ، حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ أَبِي بَكْرَةَ، عَنْ أَبِيهِ ـ رضى الله عنه ـ قَالَ نَهَى النَّبِيُّ صلى الله عليه وسلم عَنِ الْفِضَّةِ بِالْفِضَّةِ وَالذَّهَبِ بِالذَّهَبِ، إِلاَّ سَوَاءً بِسَوَاءٍ، وَأَمَرَنَا أَنْ نَبْتَاعَ الذَّهَبَ بِالْفِضَّةِ كَيْفَ شِئْنَا، وَالْفِضَّةَ بِالذَّهَبِ كَيْفَ شِئْنَا.
Imran ibn Maysara narrated to us: Abbad ibn al-Awwam narrated to us: Yahya ibn Abi Ishaq informed us: Abd al-Rahman ibn Abi Bakra narrated to us, from his father, may Allah be pleased with him, who said: The Prophet forbade silver for silver and gold for gold except equal for equal. He instructed us to exchange gold for silver, and silver for gold, as we wished.
Translation notes
The report requires equal exchange within the same metal while allowing gold and silver to be exchanged across types as the parties wish.