عَنْ عُقْبَةَ بْنِ عَامِرٍ رَضِيَ اللَّهُ عَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ الْمُسْلِمُ أَخُو الْمُسْلِمِ لَا يَحِلُّ لِامْرِئٍ مُسْلِمٍ أَنْ يُغَيِّبَ مَا بِسِلْعَتِهِ عَنْ أَخِيهِ إِنْ عَلِمَ بِهَا تَرَكَهَا
It is narrated from Sayyiduna Uqbah bin Amir (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: A Muslim is the brother of a Muslim. It is not lawful for any Muslim to conceal such a defect in his goods from his brother that if the buyer were to find out about it, he would leave that thing.