"The Messenger of Allah forbade meeting (the traders on the way) a Muhajhir selling for a Bedouin, keeping the milk in the udder of an animal (so as to increase its price), artificially inflating prices, a man to urge the cancellation of sale already agreed upon and a woman to ask that her sister (in faith) be divorced." (Using translation from Nasāʾī 4491)  

نَهَى النَّبِيُّ ﷺ عَنِ التَّلَقِّي وَأَنْ يَبِيعَ مُهَاجِرٌ لِأَعْرَابِيٍّ وَعَنِ التَّصْرِيَةِ وَالنَّجْشِ وَأَنْ يُسَاوِمَ الرَّجُلُ عَلَى سَوْمِ أَخِيهِ وَأَنْ تَسْأَلَ الْمَرْأَةُ طَلَاقَ أُخْتِهَا