عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ ((لَا تَنَاجَشُوا وَلَا تَدَابَرُوا وَلَا تَنَافَسُوا وَلَا تَحَاسَدُوا وَلَا تَبَاغَضُوا وَلَا يَسْتَامُ الرَّجُلُ عَلَى سَوْمِ أَخِيهِ وَلَا يَبِعْ حَاضِرٌ لِبَادٍ دَعُوا النَّاسَ يَرْزُقُ اللَّهُ بَعْضَهُمْ مِنْ بَعْضٍ وَلَا تَشْتَرِطِ امْرَأَةٌ طَلَاقَ أُخْتِهَا))
Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: Do not practice Najsh (artificially inflating prices), avoid mutual estrangement, do not compete with each other in transactions, avoid envy of one another, do not harbor malice against each other, no one should make an offer over the deal of his brother, a townsman should not sell on behalf of a villager, leave people alone, Allah provides sustenance to some through others, and no woman should stipulate the divorce of her sister as a condition.