Sahih al-Bukhari
Sahih al-Bukhari 2177
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنْ نَافِعٍ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ ـ رضى الله عنه ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " لاَ تَبِيعُوا الذَّهَبَ بِالذَّهَبِ إِلاَّ مِثْلاً بِمِثْلٍ، وَلاَ تُشِفُّوا بَعْضَهَا عَلَى بَعْضٍ، وَلاَ تَبِيعُوا الْوَرِقَ بِالْوَرِقِ إِلاَّ مِثْلاً بِمِثْلٍ، وَلاَ تُشِفُّوا بَعْضَهَا عَلَى بَعْضٍ، وَلاَ تَبِيعُوا مِنْهَا غَائِبًا بِنَاجِزٍ "
Abdullah ibn Yusuf informed us: Malik informed us, from Nafi, from Abu Said al-Khudri, may Allah be pleased with him, that the Messenger of Allah said: “Do not sell gold for gold except like for like, and do not give one amount more than the other. Do not sell silver for silver except like for like, and do not give one amount more than the other. Do not sell any of it that is absent in exchange for what is present.”
Translation notes
The final clause prohibits exchanging a deferred delivery of gold or silver for an immediate one. The Arabic states like for like but does not specify weight in this wording.