(4) باب تَحْرِيمِ بَيْعِ الرَّجُلِ عَلَى بَيْعِ أَخِيهِ وَسَوْمِهِ عَلَى سَوْمِهِ وَتَحْرِيمِ النَّجْشِ وَتَحْرِيمِ التَّصْرِيَةِ
Ibn '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. (IT)
Reference (IT): Sahih Muslim 1412 e (IT)
In-book reference (IT): Book 21, Hadith 11 (IT)
USC-MSA web (English) reference(deprecated numbering scheme): Book 10, Hadith 3617 (IT)