Abu Bakr bin Abi Zuhair (may Allah be pleased with him) narrates from his father that I heard the Prophet (peace be upon him) during the time of Prophethood in Taif saying: "O people! Soon you will be able to distinguish between the people of Paradise and the people of Hell, or between the good and the bad." A man asked: O Messenger of Allah! How is that? The Prophet (peace be upon him) said: Through the good and bad praise of people, because you are Allah's witnesses over one another on the earth.
Hadith Referenceمسند احمد / من مسند القبائل / 27645
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد حسن