حَدَّثَنَا عَبْدُ الرَّزَّاقِ أَخْبَرَنَا إِسْرَائِيلُ عَنْ سِمَاكٍ عَنْ سَعِيدِ بْنِ جُبَيْرٍ عَنِ ابْنِ عُمَرَ أَنَّهُ سَأَلَ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَشْتَرِي الذَّهَبَ بِالْفِضَّةِ فَقَالَ إِذَا أَخَذْتَ وَاحِدًا مِنْهُمَا فَلَا يُفَارِقْكَ صَاحِبُكَ وَبَيْنَكَ وَبَيْنَهُ لَبْسٌ
مسند امام احمد بن حنبل · Hadith 4883
It was narrated from Ibn 'Umar that he asked the Prophet (PBUH) Can i buy gold for silver? He said: "If you take one of them, you and yotr counterpart should not separate until everything is clear (i.e., the exchange is complete)."
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020