Sunan an-Nasa'i, Volume 5, Book 44, Hadith 4501 (DarusSalam) ⓘ
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 )
أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " لاَ تَلَقُّوا الرُّكْبَانَ لِلْبَيْعِ وَلاَ يَبِعْ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ - وَلاَ تَنَاجَشُوا - وَلاَ يَبِيعُ حَاضِرٌ لِبَادٍ " .
also referenced under: Hadith 4496 (Reference) & Book 44, Hadith 48 (In-Book)