4521An NasaiSahih (Darussalam)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 forbade artificially inflating prices.Reference: Sunan an-Nasa'i 4505 In-book : Book 44, Hadith 57 English translation : Vol. 5, Book 44, Hadith 4509