The Prophet ﷺ forbade najsh.
قرأت على مصعب بن عبد الله الزبيري عن مالك ح و حدثنا أبو حذافة حدثنا مالك بن أنس عن نافع
أن النبي ﷺ نهى عن النجش
No references are available.
Bukhari narrated it in the Book of Sales, chapter on najsh (artificially bidding up the price) and on those who said that such a sale is not permissible, hadith no. 2142, and Muslim, in the Book of Sales, chapter on the prohibition of a man selling over his brother's sale and bidding over his brother's bid, and the prohibition of najsh, and the prohibition of it, and it is in Muwatta (Yahya's recension) 2/684, tasriyah, hadith no. 1516, from the hadith of Malik through the same chain, and it is in