The Messenger of Allah ﷺ said: Gold is to be paid for with gold, raw and coined, silver with silver, raw and coined (in equal weight), wheat with wheat in equal measure, barley with barley in equal measure, dates with dates in equal measure, salt by salt with equal measure; if anyone gives more or asks more, he has dealt in usury. But there is no harm in selling gold for silver and silver (for gold), in unequal weight, payment being made on the spot. Do not sell them if they are to be paid for later. There is no harm in selling wheat for barley and barley (for wheat) in unequal measure, payment being made on the spot. If the payment is to be made later, then do not sell them. Abu Dawud said: This tradition has also been transmitted by Sa'id b. Abi 'Arubah, Hisham al-Dastawa'i and Qatadah from Muslim b. Yasar through his chain.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ الذَّهَبُ بِالذَّهَبِ تِبْرُهَا وَعَيْنُهَا وَالْفِضَّةُ بِالْفِضَّةِ تِبْرُهَا وَعَيْنُهَا وَالْبُرُّ بِالْبُرِّ مُدْىٌ بِمُدْىٍ وَالشَّعِيرُ بِالشَّعِيرِ مُدْىٌ بِمُدْىٍ وَالتَّمْرُ بِالتَّمْرِ مُدْىٌ بِمُدْىٍ وَالْمِلْحُ بِالْمِلْحِ مُدْىٌ بِمُدْىٍ فَمَنْ زَادَ أَوِ ازْدَادَ فَقَدْ أَرْبَى وَلاَ بَأْسَ بِبَيْعِ الذَّهَبِ بِالْفِضَّةِ وَالْفِضَّةُ أَكْثَرُهُمَا يَدًا بِيَدٍ وَأَمَّا نَسِيئَةً فَلاَ وَلاَ بَأْسَ بِبَيْعِ الْبُرِّ بِالشَّعِيرِ وَالشَّعِيرُ أَكْثَرُهُمَا يَدًا بِيَدٍ وَأَمَّا نَسِيئَةً فَلاَ  

That the Prophet ﷺ said: "Gold for gold, kind for kind; silver for silver, kind for kind; dried-dates for dried-dates, kind for kind; wheat for wheat, kind for kind; salt for salt, kind for kind; and barley for barley, kind for kind. Whoever increases or seeks an increase, then he dealt with Riba. Sell gold for silver as you wish, hand to hand; and sell wheat for dried-dates as you wish, hand to hand; and sell barley for dried-dates as you wish, hand to hand." [He said:] There are narrations on this topic from Abu Sa'eed, Abu Hurairah, Bilal, And Anas.  

عَنِ النَّبِيِّ ﷺ قَالَ الذَّهَبُ بِالذَّهَبِ مِثْلاً بِمِثْلٍ وَالْفِضَّةُ بِالْفِضَّةِ مِثْلاً بِمِثْلٍ وَالتَّمْرُ بِالتَّمْرِ مِثْلاً بِمِثْلٍ وَالْبُرُّ بِالْبُرِّ مِثْلاً بِمِثْلٍ وَالْمِلْحُ بِالْمِلْحِ مِثْلاً بِمِثْلٍ وَالشَّعِيرُ بِالشَّعِيرِ مِثْلاً بِمِثْلٍ فَمَنْ زَادَ أَوِ ازْدَادَ فَقَدْ أَرْبَى بِيعُوا الذَّهَبَ بِالْفِضَّةِ كَيْفَ شِئْتُمْ يَدًا بِيَدٍ وَبِيعُوا الْبُرَّ بِالتَّمْرِ كَيْفَ شِئْتُمْ يَدًا بِيَدٍ وَبِيعُوا الشَّعِيرَ بِالتَّمْرِ كَيْفَ شِئْتُمْ يَدًا بِيَدٍ قَالَ وَفِي الْبَابِ عَنْ أَبِي سَعِيدٍ وَأَبِي هُرَيْرَةَ وَبِلاَلٍ وَأَنَسٍ  

[Machine] The Messenger of Allah ﷺ said, "Gold should be exchanged with gold based on weight, and silver should be exchanged with silver based on weight. Salt should be exchanged with salt in equal measure, barley should be exchanged with barley in equal measure, wheat should be exchanged with wheat in equal measure, and dates should be exchanged with dates in equal measure. Anyone who adds more or asks for more has engaged in a form of usury. So, sell gold for silver hand to hand, however you wish, sell dates for salt hand to handing, and sell barley for wheat hand to hand, however you wish."  

قَالَ رَسُولُ اللهِ ﷺ الذَّهَبُ بِالذَّهَبِ وَزْنًا بِوَزْنٍ وَالْفِضَّةُ بِالْفِضَّةِ وَزْنًا بِوَزْنٍ وَالْمِلْحُ بِالْمِلْحِ مِثْلًا بِمِثْلٍ وَالشَّعِيرُ بِالشَّعِيرِ مِثْلًا بِمِثْلٍ وَالْبُرُّ بِالْبُرِّ مِثْلًا بِمِثْلٍ وَالتَّمْرُ بِالتَّمْرِ مِثْلًا بِمِثْلٍ فَمَنْ زَادَ أَوِ اسْتَزَادَ فَقَدْ أَرْبَى فَبِيعُوا الذَّهَبَ بِالْفِضَّةِ يَدًا بِيَدٍ كَيْفَ شِئْتُمْ وَالتَّمْرَ بِالْمِلْحِ يَدًا بِيَدٍ وَالشَّعِيرَ بِالْبُرِّ يَدًا بِيَدٍ كَيْفَ شِئْتُمْ  

"التَّمْرُ بالتَّمْرِ مثْلًا بمِثْل، والحِنْطَةُ بالحِنْطَةِ مِثْلًا بمِثْل، والشعيرُ بالشعيرِ مِثْلًا بِمِثْل، والمِلحُ بالمِلحِ مِثْلًا بِمِثْل، والذَّهَبُ بالذهب مِثْلًا بِمِثْل وزنًا بوَزْن، والفِضَّةُ بالفِضَّةِ، مِثْلًا بِمِثْل وَزنًا بوَزْن، فما كان من فضل فهو ربا".