Sell it, and then buy with it barley. The slave went away and he got a sa' (of barley) and a part of sa' over and above that. When he came to Ma'mar he informed him about that, whereupon Ma'mar said to him: Why did you do that? Go back and return that, and do not accept but weight, for weight, for I used to hear from Allah's Apostle ﷺ as saying: Wheat for wheat and like for like. He (one of the narrators) said: Our food in those days consisted of barley. It was said to him (Ma'mar) that (wheat) is not like that (barley). He replied: I am afraid these may not be similar  

بِعْهُ ثُمَّ اشْتَرِ بِهِ شَعِيرًا فَذَهَبَ الْغُلاَمُ فَأَخَذَ صَاعًا وَزِيَادَةَ بَعْضِ صَاعٍ فَلَمَّا جَاءَ مَعْمَرًا أَخْبَرَهُ بِذَلِكَ فَقَالَ لَهُ مَعْمَرٌ لِمَ فَعَلْتَ ذَلِكَ انْطَلِقْ فَرُدَّهُ وَلاَ تَأْخُذَنَّ إِلاَّ مِثْلاً بِمِثْلٍ فَإِنِّي كُنْتُ أَسْمَعُ رَسُولَ اللَّهِ ﷺ يَقُولُ الطَّعَامُ بِالطَّعَامِ مِثْلاً بِمِثْلٍ قَالَ وَكَانَ طَعَامُنَا يَوْمَئِذٍ الشَّعِيرَ قِيلَ لَهُ فَإِنَّهُ لَيْسَ بِمِثْلِهِ قَالَ إِنِّي أَخَافُ أَنْ يُضَارِعَ  

[Machine] He sent his servant with a measure of wheat and told him to exchange it for barley. The servant went and took a measure and an additional amount of barley. When he came back, Ma'mar informed him of that, and Ma'mar said to him, "Did you do that? Go and return it and take only an equal amount for what you gave. For I used to hear the Messenger of Allah ﷺ say: 'Food is exchanged for food in equal amounts.' And our food that day was barley." It was said that there was nothing like it. Ma'mar said, "I fear it might have been mingled (with impurities)."  

أَنَّهُ أَرْسَلَ غُلَامًا لَهُ بِصَاعٍ مِنْ قَمْحٍ فَقَالَ لَهُ بِعْهُ ثُمَّ اشْتَرِ بِهِ شَعِيرًا فَذَهَبَ الْغُلَامُ فَأَخَذَ صَاعًا وَزِيَادَةَ بَعْضِ صَاعٍ فَلَمَّا جَاءَ مَعْمَرٌ أَخْبَرَهُ بِذَلِكَ فَقَالَ لَهُ مَعْمَرٌ أَفَعَلْتَ؟ انْطَلِقْ فَرُدَّهُ وَلَا تَأْخُذْ إِلَّا مِثْلًا بِمِثْلٍ فَإِنِّي كُنْتُ أَسْمَعُ رَسُولَ اللهِ ﷺ يَقُولُ الطَّعَامُ بِالطَّعَامِ مِثْلًا بِمِثْلٍ وَكَانَ طَعَامُنَا يَوْمَئِذٍ الشَّعِيرَ قِيلَ فَإِنَّهُ لَيْسَ مِثْلَهُ قَالَ إِنِّي أَخَافُ أَنْ يُضَارِعَ  

[Machine] Buy it and then trade it for barley. So the boy went and took a measure and some extra of it. When Ma'mar came, he informed him about it, so Ma'mar said to him, "Why did you do this? Go and return it, do not take anything except the same in return, for I used to hear the Messenger of Allah ﷺ saying, ‘Food is equal to its like.’ And at that time our food was barley, so it was said that it was not equal to it, so he (the Prophet ﷺ) said, ‘I fear that it might become close to riba.’"  

بِعْهُ ثُمَّ اشْتَرِ بِهِ شَعِيرًا فَذَهَبَ الْغُلَامُ فَأَخَذَ صَاعًا وَزِيَادَةَ بَعْضِ صَاعٍ فَلَمَّا جَاءَ مَعْمَرٌ خَبَّرَهُ بِذَلِكَ فَقَالَ مَعْمَرٌ لِمَ فَعَلْتَ؟ انْطَلِقْ فَرُدَّهُ لَا تَأْخُذَنَّ إِلَّا مِثْلاً بِمِثْلٍ فَإِنِّي كُنْتُ أَسْمَعُ رَسُولَ اللهِ ﷺ يَقُولُ «الطَّعَامُ مِثْلًا بِمِثْلٍ» وَكَانَ طَعَامَنَا يَوْمَئِذٍ الشَّعِيرُ فَقِيلَ إِنَّهُ لَيْسَ مِثْلَهُ فَقَالَ إِنِّي أَخَافُ أَنْ يُضَارِعَ الرِّبَا