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

Narrated Abu Bakra: A man praised another man in front of the Prophet . The Prophet 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."

Narrated Abu Musa Al-Ash`ari: The Prophet heard someone praising another and exaggerating in his praise. The Prophet said, "You have ruined or cut the man's back (by praising him so much).

Narrated 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.")

Narrated Abu Bakra: A man praised another man in front of the Prophet. The Prophet said thrice, "Wailaka (Woe on you) ! You have cut the neck of your brother!" The Prophet 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.)".