It is narrated from Sayyiduna Abu Burdah that once, while on the road, the Prophet (peace and blessings be upon him) put his hand into a man's grain and took some out, and found there was deception in it. The Prophet (peace and blessings be upon him) said: "He who deceives us is not one of us."
Hadith Referenceمسند احمد / مسند المدنيين رضي الله عنهم اجمعين / 16489
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد ضعيف لضعف جميع بن عمير ، وشريك سيئ الحفظ