Sahih Muslim , Book 21, Hadith 18 (In-Book) ⓘ
Ibn Umar (Allah be pleased with them) reported that Allah's Messenger forbade the outbidding (against another).
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى عَنِ النَّجْشِ .
also referenced under: Hadith 1516 (Reference) & Book 10, Hadith 3622 (USC-MSA)