Sahih Muslim 3811
صحيح مسلم#3811SahihIbn 'Umar (Allah be pleased with them) reported Allah's Messenger (ﷺ) as having said this:One amongst you should not enter into a transaction when another is bargaining
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 21:11