Sunan an-Nasa'i 4497
سنن النسائي#4497Sahihأَخْبَرَنَا عَبْدُ الرَّحْمَنِ بْنُ عَبْدِ اللَّهِ بْنِ عَبْدِ الْحَكَمِ بْنِ أَعْيَنَ، قَالَ حَدَّثَنَا شُعَيْبُ بْنُ اللَّيْثِ، عَنْ أَبِيهِ، عَنْ كَثِيرِ بْنِ فَرْقَدٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم أَنَّهُ نَهَى عَنِ النَّجْشِ وَالتَّلَقِّي وَأَنْ يَبِيعَ حَاضِرٌ لِبَادٍ .
It was narrated from 'Abdullah that:the Messenger of Allah forbade artificially inflating prices, meeting traders on the way, and for a town-dweller to sell for a desert-dweller." (Sahih)
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 44:49