Sahih Bukhari Volume 8, Book 78, Hadith 6063

حَدَّثَنَا آدَمُ، حَدَّثَنَا شُعْبَةُ، عَنْ خَالِدٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي بَكْرَةَ، عَنْ أَبِيهِ، أَنَّ رَجُلاً، ذُكِرَ عِنْدَ النَّبِيِّ صلى الله عليه وسلم فَأَثْنَى عَلَيْهِ رَجُلٌ خَيْرًا، فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ وَيْحَكَ قَطَعْتَ عُنُقَ صَاحِبِكَ ـ يَقُولُهُ مِرَارًا ـ إِنْ كَانَ أَحَدُكُمْ مَادِحًا لاَ مَحَالَةَ فَلْيَقُلْ أَحْسِبُ كَذَا وَكَذَا‏.‏ إِنْ كَانَ يُرَى أَنَّهُ كَذَلِكَ، وَحَسِيبُهُ اللَّهُ، وَلاَ يُزَكِّي عَلَى اللَّهِ أَحَدًا ‏"‏‏.‏ قَالَ وُهَيْبٌ عَنْ خَالِدٍ ‏"‏ وَيْلَكَ ‏"‏‏.‏

Narrated By Abu Bakra : A man was mentioned before the Prophet and another man praised him greatly The Prophet said, "May Allah's Mercy be on you ! You have cut the neck of your friend." The Prophet repeated this sentence many times and said, "If it is indispensable for anyone of you to praise someone, then he should say, 'I think that he is so-and-so," if he really thinks that he is such. Allah is the One Who will take his accounts (as He knows his reality) and no-one can sanctify anybody before Allah." (Khalid said, "Woe to you," instead of "Allah's Mercy be on you.")