The Messenger of Allah said: "No town-dweller should sell for a desert-dweller, do not artificially inflate prices, no man should urge a seller to cancel a sale already agreed upon with another buy so as to by the goods himself, no one should make a proposal over the proposal of his brother and no woman should make a proposal over the proposal of his brother and no woman should ask for her sister in faith) to be divorced so as to turn over what is in her vessel Deprived her of her share of maintenance) and so that she may get married in her place: she will have what Allah has decreed or her." (Using translation from Nasāʾī 4502)  

قَالَ رَسُولُ اللهِ ﷺ «لَا يَبِيعَنَّ حَاضِرٌ لِبَادٍ وَلَا تَنَاجَشُوا وَلَا يُسَاوِمِ الرَّجُلُ عَلَى سَوْمِ أَخِيهِ وَلَا يَخْطُبْ عَلَى خِطْبَةِ أَخِيهِ وَلَا تَسْأَلِ الْمَرْأَةُ طَلَاقَ أُخْتِهَا لِتَكْتَفِئَ مَا فِي إِنَائِهَا وَلْتَنْكِحْ فَإِنَّمَا لَهَا مَا كَتَبَ اللهُ لَهَا»