Musnad Ahmad 314
It was narrated that Malik bin Aws bin al-Hadathan said:
l brought some dinars of mine and wanted to exchange them. Talhah bin ‘Ubaidullah met me and we agreed to an exchange. Then he took them and said: Wait until my storekeeper comes - Abu `Amir said. From al-Ghalal (a place). And he said concerning it. All of it should be ‘Take this’ and `take this` [i.e., exchanged on the spot]. - I asked ‘Umar bin al-Khattab (رضي الله عنه) about that and he said: I heard the Messenger of Allah (ﷺ) say: `Silver for gold is riba, unless it is exchanged on the spot, wheat for wheat is riba, unless it is exchanged on the spot; barley for barley is riba, unless it is exchanged on the spot dates for dates is ribu unless it is exchanged on the spot.”
حَدَّثَنَا عُثْمَانُ بْنُ عُمَرَ، وَأَبُو عَامِرٍ قَالَ حَدَّثَنَا مَالِكٌ، عَنِ الزُّهْرِيِّ، عَنْ مَالِكِ بْنِ أَوْسِ بْنِ الْحَدَثَانِ، قَالَ جِئْتُ بِدَنَانِيرَ لِي فَأَرَدْتُ أَنْ أَصْرِفَهَا فَلَقِيَنِي طَلْحَةُ بْنُ عُبَيْدِ اللَّهِ فَاصْطَرَفَهَا وَأَخَذَهَا فَقَالَ حَتَّى يَجِيءَ سَلْمٌ خَازِنِي قَالَ أَبُو عَامِرٍ مِنْ الْغَابَةِ وَقَالَ فِيهَا كُلِّهَا هَاءَ وَهَاءَ قَالَ فَسَأَلْتُ عُمَرَ بْنَ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ عَنْ ذَلِكَ فَقَالَ سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ الذَّهَبُ بِالْوَرِقِ رِبًا إِلَّا هَاءَ وَهَاءَ وَالْبُرُّ بِالْبُرِّ رِبًا إِلَّا هَاءَ وَهَاءَ وَالشَّعِيرُ بِالشَّعِيرِ رِبًا إِلَّا هَاءَ وَهَاءَ وَالتَّمْرُ بِالتَّمْرِ رِبًا إِلَّا هَاءَ وَهَاءَ‏.‏