(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. (ES)
Reference (ES): Sahih Muslim 1412 e (ES)
In-book reference (ES): Book 21, Hadith 11 (ES)
USC-MSA web (English) reference(deprecated numbering scheme): Book 10, Hadith 3617 (ES)