Sahih Muslim 3001
Sahih Muslim · Book 55: The Book of Zuhd and Softening of Hearts · The Prohibition Of Praising if It Involves Exaggeration And There Is The Fear That It May Be A Source Of Temptation (Fitnah) For The One Who Is Praised
Abu Musa reported Allah's Messenger (ﷺ) saw a person lauding another person or praising him too much. Thereupon he said:
حَدَّثَنِي أَبُو جَعْفَرٍ، مُحَمَّدُ بْنُ الصَّبَّاحِ حَدَّثَنَا إِسْمَاعِيلُ بْنُ زَكَرِيَّاءَ ، عَنْ بُرَيْدِ بْنِ، عَبْدِ اللَّهِ بْنِ أَبِي بُرْدَةَ عَنْ أَبِي بُرْدَةَ ، عَنْ أَبِي مُوسَى ، قَالَ سَمِعَ النَّبِيُّ صلى الله عليه وسلم رَجُلاً يُثْنِي عَلَى رَجُلٍ وَيُطْرِيهِ فِي الْمِدْحَةِ فَقَالَ " لَقَدْ أَهْلَكْتُمْ أَوْ قَطَعْتُمْ ظَهْرَ الرَّجُلِ " .
You killed him, or you sliced the back of a person.