It is narrated from Hazrat Uqbah bin Amir (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: Every Muslim is a brother to another Muslim. It is not lawful for any Muslim to conceal any defect in goods from his brother, such that if he were to know of that defect, he would leave it.
Hadith Referenceمسند احمد / مسند الشاميين / 17451
Hadith Gradingحکم دارالسلام:حديث حسن، وهذا إسناد ضعيف من أجل ابن لهيعة، وقد توبع