"I heard 'Umar bin Al-Khattab say: 'The Messenger of Allah ﷺ said: "Exchanging gold for gold is usury unless it is done on the spot. (Exchanging) wheat for wheat is usury, unless it is done on the spot. (Exchanging) barley for barley is usury unless it is done on the spot. (Exchanging) dates for dates is usury, unless it is done on the spot."  

قَالَ رَسُولُ اللَّهِ ﷺ الذَّهَبُ بِالذَّهَبِ رِبًا إِلاَّ هَاءَ وَهَاءَ وَالْبُرُّ بِالْبُرِّ رِبًا إِلاَّ هَاءَ وَهَاءَ وَالشَّعِيرُ بِالشَّعِيرِ رِبًا إِلاَّ هَاءَ وَهَاءَ وَالتَّمْرُ بِالتَّمْرِ رِبًا إِلاَّ هَاءَ وَهَاءَ  

"Ubadah bin Samit and Mu'awiyah happened to meet, either in a church or in a synagogue. 'Ubadah bin Samit narrated to them and said: 'The Messenger of Allah ﷺ forbade us from selling silver for silver, gold for gold, wheat for wheat, barley for barley, and dates for dates.'I one of them said: "And salt for salt," but the other did not say it. "And he commanded us to sell wheat for barley, or barley for wheat, hand-to-hand, however we wished."  

نَهَانَا رَسُولُ اللَّهِ ﷺ عَنْ بَيْعِ الْوَرِقِ بِالْوَرِقِ وَالذَّهَبِ بِالذَّهَبِ وَالْبُرِّ بِالْبُرِّ وَالشَّعِيرِ بِالشَّعِيرِ وَالتَّمْرِ بِالتَّمْرِ قَالَ أَحَدُهُمَا وَالْمِلْحِ بِالْمِلْحِ وَلَمْ يَقُلْهُ الآخَرُ وَأَمَرَنَا أَنْ نَبِيعَ الْبُرَّ بِالشَّعِيرِ وَالشَّعِيرَ بِالْبُرِّ يَدًا بِيَدٍ كَيْفَ شِئْنَا  

'(Sell) silver for silver, gold for gold, barley for barley, wheat for wheat, like for like."  

عَنِ النَّبِيِّ ﷺ قَالَ الْفِضَّةُ بِالْفِضَّةِ وَالذَّهَبُ بِالذَّهَبِ وَالشَّعِيرُ بِالشَّعِيرِ وَالْحِنْطَةُ بِالْحِنْطَةِ مِثْلاً بِمِثْلٍ  

“The Prophet used to give us dates from the collection (mixed) [1] dates, and we would exchange them for dates that were better, and we add to the price. [2] The Messenger of Allah said: ‘It is not right to give one Sa of dates for two Sa, nor one Dirham for two Dirham. A Dirham for a Dirham and a Dinar for a Dinar is allowed: the only difference between them is in weight (i.e., the weight must be equal.)’” Sahih  

كَانَ النَّبِيُّ ﷺ يَرْزُقُنَا تَمْرًا مِنْ تَمْرِ الْجَمْعِ فَنَسْتَبْدِلُ بِهِ تَمْرًا هُوَ أَطْيَبُ مِنْهُ وَنَزِيدُ فِي السِّعْرِ فَقَالَ رَسُولُ اللَّهِ ﷺ لاَ يَصْلُحُ صَاعُ تَمْرٍ بِصَاعَيْنِ وَلاَ دِرْهَمٌ بِدِرْهَمَيْنِ وَالدِّرْهَمُ بِالدِّرْهَمِ وَالدِّينَارُ بِالدِّينَارِ لاَ فَضْلَ بَيْنَهُمَا إِلاَّ وَزْنًا