Sunan Ibn Majah, Book 12, Hadith 2331 (In-Book) ⓘ
It was narrated that 'Uqbah bin 'Amir said: "I heard the Messenger of Allah say: 'The Muslim is the brother of another Muslim, and it is not permissible for a Muslim to sell his brother goods in which there is a defect, without pointing that out to him."'
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا وَهْبُ بْنُ جَرِيرٍ، حَدَّثَنَا أَبِي، سَمِعْتُ يَحْيَى بْنَ أَيُّوبَ، يُحَدِّثُ عَنْ يَزِيدَ بْنِ أَبِي حَبِيبٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ شُمَاسَةَ، عَنْ عُقْبَةَ بْنِ عَامِرٍ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ يَقُولُ " الْمُسْلِمُ أَخُو الْمُسْلِمِ وَلاَ يَحِلُّ لِمُسْلِمٍ بَاعَ مِنْ أَخِيهِ بَيْعًا فِيهِ عَيْبٌ إِلاَّ بَيَّنَهُ لَهُ " .
also referenced under: Hadith 2246 (Reference) & Volume 3, Book 12, Hadith 2246 (DarusSalam)