أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ حَدَّثَنِي مُحَمَّدُ بْنُ الزِّبْرِقَانِ، قَالَ حَدَّثَنَا يُونُسُ بْنُ عُبَيْدٍ، عَنِ الْحَسَنِ، عَنْ أَنَسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم نَهَى أَنْ يَبِيعَ حَاضِرٌ لِبَادٍ وَإِنْ كَانَ أَبَاهُ أَوْ أَخَاهُ ‏.‏

It was narrated from Abu Hurairah that the Messenger of Allah said

"Do not go out to meet the riders, and do not urge someone to cancel a sale he has already agreed upon os as to sell him your own goods, do not artificially inflate prices, and let not a town-dweller sell for a desert-dweller." (Sahih )