"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."  

نَهَى رَسُولُ اللَّهِ ﷺ عَنِ التَّلَقِّي وَأَنْ يَبِيعَ مُهَاجِرٌ لِلأَعْرَابِيِّ وَعَنِ التَّصْرِيَةِ وَالنَّجْشِ وَأَنْ يَسْتَامَ الرَّجُلُ عَلَى سَوْمِ أَخِيهِ وَأَنْ تَسْأَلَ الْمَرْأَةُ طَلاَقَ أُخْتِهَا