The Prophet ﷺ heard someone praising another and exaggerating in his praise. The Prophet ﷺ said, "You have ruined or cut the man's back (by praising him so much).  

سَمِعَ النَّبِيُّ ﷺ رَجُلاً يُثْنِي عَلَى رَجُلٍ وَيُطْرِيهِ فِي مَدْحِهِ فَقَالَ أَهْلَكْتُمْ أَوْ قَطَعْتُمْ ظَهْرَ الرَّجُلِ  

The Prophet ﷺ heard a man praising another man and he was exaggerating in his praise. The Prophet ﷺ said (to him). "You have destroyed (or cut) the back of the man."  

سَمِعَ النَّبِيُّ ﷺ رَجُلاً يُثْنِي عَلَى رَجُلٍ وَيُطْرِيهِ فِي الْمِدْحَةِ فَقَالَ أَهْلَكْتُمْ أَوْ قَطَعْتُمْ ظَهْرَ الرَّجُلِ  

A man praised another man in front of the Prophet ﷺ . The Prophet ﷺ said to him, "Woe to you, you have cut off your companion's neck, you have cut off your companion's neck," repeating it several times and then added, "Whoever amongst you has to praise his brother should say, 'I think that he is so and so, and Allah knows exactly the truth, and I do not confirm anybody's good conduct before Allah, but I think him so and so,' if he really knows what he says about him."  

أَثْنَى رَجُلٌ عَلَى رَجُلٍ عِنْدَ النَّبِيِّ ﷺ فَقَالَ وَيْلَكَ قَطَعْتَ عُنُقَ صَاحِبِكَ قَطَعْتَ عُنُقَ صَاحِبِكَ مِرَارًا ثُمَّ قَالَ مَنْ كَانَ مِنْكُمْ مَادِحًا أَخَاهُ لَا مَحَالَةَ فَلْيَقُلْ أَحْسِبُ فُلَانًا وَاللَّهُ حَسِيبُهُ وَلَا أُزَكِّي عَلَى اللَّهِ أَحَدًا أَحْسِبُهُ كَذَا وَكَذَا إِنْ كَانَ يَعْلَمُ ذَلِكَ مِنْهُ  

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.")  

أَنَّ رَجُلاً ذُكِرَ عِنْدَ النَّبِيِّ ﷺ فَأَثْنَى عَلَيْهِ رَجُلٌ خَيْرًا فَقَالَ النَّبِيُّ ﷺ وَيْحَكَ قَطَعْتَ عُنُقَ صَاحِبِكَ يَقُولُهُ مِرَارًا 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  

A man praised another man in front of the Prophet. The Prophet ﷺ said thrice, "Wailaka (Woe on you) ! You have cut the neck of your brother!" The Prophet ﷺ added, "If it is indispensable for anyone of you to praise a person, then he should say, "I think that such-and-such person (is so-and-so), and Allah is the one who will take his accounts (as he knows his reality) and none can sanctify anybody before Allah (and that only if he knows well about that person.)".  

أَثْنَى رَجُلٌ عَلَى رَجُلٍ عِنْدَ النَّبِيِّ ﷺ فَقَالَ وَيْلَكَ قَطَعْتَ عُنُقَ أَخِيكَ ثَلاَثًا مَنْ كَانَ مِنْكُمْ مَادِحًا لاَ مَحَالَةَ فَلْيَقُلْ أَحْسِبُ فُلاَنًا وَاللَّهُ حَسِيبُهُ وَلاَ أُزَكِّي عَلَى اللَّهِ أَحَدًا إِنْ كَانَ يَعْلَمُ