Sahih al-Bukhari 6061
Narrated Abu Bakra:
A man was mentioned before the Prophet (ﷺ) and another man praised him greatly The Prophet (ﷺ) said, 
"May Allah's Mercy be on you ! You have cut the neck of your friend." The Prophet (ﷺ) 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.")
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 ‏"‏‏.‏