سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 4505
The Book of Financial Transactions
Artificially Inflating Prices
أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم نَهَى عَنِ النَّجْشِ .
It was narrated from Ibn 'Umar that: the Prophet (ﷺ) forbade artificially inflating prices.
Sunan an-Nasa'i, 4505Sahih (Darussalam)