That the Messenger of Allah (ﷺ) said: "None of you is to sell over the sale of others, nor to propose over the proposal of others." [He said:] There are narration on this topic from Abu Hurairah and Samurah. [Abu 'Eisa said:] The Hadith of Ibn 'Umar is a Hasan Sahih Hadith. And it has been reported from the Prophet (ﷺ) that he said: "Do not haggle in competition with your brother's haggling." And the meaning of sale in this Hadith of the Prophet (ﷺ), according to some of the people of knowledge is to haggle.
حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا اللَّيْثُ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " لاَ يَبِيعُ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ وَلاَ يَخْطُبُ بَعْضُكُمْ عَلَى خِطْبَةِ بَعْضٍ " . قَالَ وَفِي الْبَابِ عَنْ أَبِي هُرَيْرَةَ وَسَمُرَةَ . قَالَ أَبُو عِيسَى حَدِيثُ ابْنِ عُمَرَ حَدِيثٌ حَسَنٌ صَحِيحٌ . وَقَدْ رُوِيَ عَنِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ قَالَ " لاَ يَسُومُ الرَّجُلُ عَلَى سَوْمِ أَخِيهِ " . وَمَعْنَى الْبَيْعِ فِي هَذَا الْحَدِيثِ عَنِ النَّبِيِّ صلى الله عليه وسلم عِنْدَ بَعْضِ أَهْلِ الْعِلْمِ هُوَ السَّوْمُ .
Tirmizi
The Book on Business • Hadith 1301