It is narrated from Sayyiduna Abu Bakrah (may Allah be pleased with him) that a person was mentioned in the presence of the Prophet (peace and blessings of Allah be upon him), so a man praised him well. The Prophet (peace and blessings of Allah be upon him) said: "Alas, you have cut your companion's neck." The Prophet (peace and blessings of Allah be upon him) kept repeating this. "If any of you must praise someone, he should say: 'I think so-and-so is such and such,' if he thinks him to be so, and his reckoning is with Allah, and do not present anyone's purity before Allah."