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قَالَ النَّبِيُّ صلى الله عليه وسلم: إِذَا كَانَ أَحَدُكُم مَادِحاً صَاحِبَهُ لاَ مَحَالَةَ فَلْيَقُلْ: أَحْسِبُ فُلاَناً وَاللَّهُ حَسِيبُهُ, وَلاَ أُزَكِّي عَلَى اللَّهِ أَحَداً, أَحْسِبُهُ – إِنْ كَانَ يَعْلَمُ ذَاكَ – كَذَا وَكَذَا
(He r said: ‘If anyone of you is impelled to praise his brother, then he should say: ‘I deem so-and-so to be…and Allah is his reckoner…and I don’t praise anyone, putting it (i.e. my praising) forward, in front of Allah’s commendation, however I assume him so and so’…if he knows that of him.)
Source: Muslim 4/2296.