Sunan an-Nasa'i, Volume 5, Book 44, Hadith 4499 (DarusSalam) ⓘ
It was narrated that Anas said: "It was forbidden to us for a town-dweller to sell for a desert-dweller." (Sahih )
أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، قَالَ حَدَّثَنَا خَالِدٌ، قَالَ حَدَّثَنَا ابْنُ عَوْنٍ، عَنْ مُحَمَّدٍ، عَنْ أَنَسٍ، قَالَ نُهِينَا أَنْ يَبِيعَ، حَاضِرٌ لِبَادٍ .
also referenced under: Hadith 4494 (Reference) & Book 44, Hadith 46 (In-Book)