Sunan an-Nasa'i 4502
It was narrated that Abu Hurairah said:
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."
حَدَّثَنَا مُجَاهِدُ بْنُ مُوسَى، قَالَ حَدَّثَنَا إِسْمَاعِيلُ، عَنْ مَعْمَرٍ، عَنِ الزُّهْرِيِّ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏
"‏ لاَ يَبِيعَنَّ حَاضِرٌ لِبَادٍ وَلاَ تَنَاجَشُوا وَلاَ يُسَاوِمِ الرَّجُلُ عَلَى سَوْمِ أَخِيهِ وَلاَ يَخْطُبْ عَلَى خِطْبَةِ أَخِيهِ وَلاَ تَسْأَلِ الْمَرْأَةُ طَلاَقَ أُخْتِهَا لِتَكْتَفِئَ مَا فِي إِنَائِهَا وَلِتُنْكَحَ فَإِنَّمَا لَهَا مَا كَتَبَ اللَّهُ لَهَا ‏"‏ ‏.‏