The Book Pertaining to Piety and Softening of Hearts (Kitab Al-Zuhd wa Al-Raqa'iq)

Muslim :: Book 42 : Hadith 7142

Abu Ma'mar reported that a person lauded a ruler amongst the rulers and Miqdad began to throw dust upon him and he said: Allah's Messenger (may peace be upon him) commanded us that we should throw dust upon the faces of those who shower too much praise.

Source materials are from the University of Southern California MSA site
Hadith eBooks converted from Imaan Star