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."
Reference: Sahih al-Bukhari 2662 In-book : Book 52, Hadith 26 USC-MSA web (English) : Vol. 3, Book 48, Hadith 830 (deprecated)
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