Narrated from Sayyiduna Abu Bakr (may Allah be pleased with him) that a man was mentioned in the presence of the Prophet (peace and blessings of Allah be upon him), so another man praised him (excessively). The Prophet (peace and blessings of Allah be upon him) said: "Woe to you! You have cut your companion's neck." The Prophet (peace and blessings of Allah be upon him) kept repeating this statement, (then said:) "If anyone must praise someone, let him say: In my opinion, he is such and such, if he truly thinks so, and let him also say: Allah knows best. He is the one who takes account, and no one should declare anyone pure before Allah."

It is narrated from Sayyiduna Abu Musa Ash'ari (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) heard a man praising someone and exaggerating greatly in his praise. The Prophet (peace and blessings of Allah be upon him) said: "You have destroyed him," or he said: "You have broken this man's back."

It is narrated from Yazid bin Sharik Taimi that we were in the gathering of Sayyiduna Umar (may Allah be pleased with him) when a man praised another man in his presence. So Sayyiduna Umar (may Allah be pleased with him) said: You have destroyed this man, may Allah destroy you.

Sayyiduna Umar (may Allah be pleased with him) said: Praising is like slaughtering. Imam Bukhari (may Allah have mercy on him) said: The slaughtering happens when he accepts the praise.