Abu Huraira (Allah be pleased with him) reported Allah's Messenger (ﷺ) as saying:Do not meet the merchant in the way and enter into business transaction with him, and whoever meets him and buys from him (and in case it is done, see) that when the owner of (merchandise) comes into the market (and finds that he has been paid less price) he has the option (to declare the transaction null and void)
Hadith 3824 — Sahih Muslim 21:24
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَعَمْرٌو النَّاقِدُ، وَزُهَيْرُ بْنُ حَرْبٍ، قَالُوا حَدَّثَنَا سُفْيَانُ، عَنِ الزُّهْرِيِّ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ، يَبْلُغُ بِهِ النَّبِيَّ صلى الله عليه وسلم قَالَ " لاَ يَبِعْ حَاضِرٌ لِبَادٍ " . وَقَالَ زُهَيْرٌ عَنِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ نَهَى أَنْ يَبِيعَ حَاضِرٌ لِبَادٍ
Abu Huraira (Allah be pleased with him) reported it directly from Allah's Apostle (ﷺ):The townsman'should not sell for a man from the desert (with a view to taking advantage of his ignorance of the market conditions of the city). And Zuhair reported from the Prophet (ﷺ) that he forbade the townsman to sell on behalf of the man from the desert
Ibn 'Abbas (Allah be pleased with them) reported Allah's Messenger (ﷺ) as saying:The riders (carrying merchandise) should not be met in the way, and townsman should not sell for a man of the desert. The narrator reported. I said to Ibn 'Abbas: What do these words really imply-" The townsman for the man of the desert"? He said: That he should work as a broker on his behalf
Jabir (Allah be pleased with him) reported Allah's Messenger (ﷺ) as saying:The townsman should not sell for a man from the desert, leave the people alone, Allah will give them provision from one another. Yahya reported it with a slight change of words
Hadith 3827 — Sahih Muslim 21:27
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَعَمْرٌو النَّاقِدُ، قَالاَ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم بِمِثْلِهِ .
Jabir (Allah be pleased with him) reported a similar hadith from Allah's Apostle (ﷺ) through another chain of transmitters
Anas b. Malik (Allah be pleased with him) reported:We were forbidden that a townsman should sell for a man of the desert, even if he is his brother or father
Abu Huraira (Allah be pleased with him) reported Allah's Messenger (may peace be'upon him) as saying:He who bought a goat having its udder tied up should go back with it, milk it, and, if he is satisfied with its milk, he should retair it, otherwise he should return it along with a sa' of dates