Abu Ma'mar al-Azdi (may Allah have mercy on him) said: A man stood up and began praising one of the governors. Sayyiduna Miqdad bin al-Aswad (may Allah be pleased with him) stood up, threw dust in his face and said: "Indeed, the Messenger of Allah (peace and blessings be upon him) ordered us to throw dust in the faces of the flatterers."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17714