Al-Adab Al-Mufrad, Book 16, Hadith 8 (In-Book) ⓘ

'Ata' ibn Abi Rabah reported that a man was praising another man in the presence of Ibn 'Umar. Ibn 'Umar began to throw dust towards his mouth. He said, "The Messenger of Allah, may Allah bless him and grant him peace, said, 'When you see those who praise people, throw dust in their faces.'"

حَدَّثَنَا مُحَمَّدٍ، قَالَ‏:‏ حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، قَالَ‏:‏ حَدَّثَنَا حَمَّادٌ، عَنْ عَلِيِّ بْنِ الْحَكَمِ، عَنْ عَطَاءِ بْنِ أَبِي رَبَاحٍ، أَنَّ رَجُلاً كَانَ يَمْدَحُ رَجُلاً عِنْدَ ابْنِ عُمَرَ فَجَعَلَ ابْنُ عُمَرَ يَحْثُو التُّرَابَ نَحْوَ فِيهِ، وَقَالَ‏:‏ قَالَ رَسُولُ اللهِ صلى الله عليه وسلم‏:‏ إِذَا رَأَيْتُمُ الْمَدَّاحِينَ فَاحْثُوا فِي وُجُوهِهِمُ التُّرَابَ‏.‏