It is reported:
A man praised another man in front of the Prophet (sws).
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. (Abū Da’ūd, Kitābu’l-Adab)
Should then we refrain from praising our friends?