Sahih Muslim , Book 10, Hadith 3622 (USC-MSA) ⓘ
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: Book 21, Hadith 18 (In-Book) & Hadith 1516 (Reference)