451. Dua Etiquette of praising a fellow Muslim
The Prophet (ﷺ) said: "Whoever amongst you has to praise his brother should say:
أَحْسِبُ فُلَانًا وَاللَّهُ حَسِيبُهُ وَلَا أُزَكِّي عَلَى اللَّهِ أَحَدًا أَحْسِبُهُ كَذَا وَكَذَا
Dua for praising Allah English Transliteration
Ahsibu fulaanan wAllaahu haseebuhu wa laa 'uzakkee 'alAllaahi 'ahadan ahsibuhu kadha wa kadha
Dua for praising Allah English Translation
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.
It is to be said when you must ensure you have knowledge that the certain characteristic is present in that person.
Hadith about the Dua
Arabic Text
عَنْ أَبِي وَائِلٍ، قَالَ قَالَ عَبْدُ اللَّهِ: إِذَا أَثْنَيْتَ عَلَى صَاحِبِكَ فَقُلْ: أَحْسِبُ فُلَانًا وَاللَّهُ حَسِيبُهُ، وَلَا أُزَكِّي عَلَى اللَّهِ أَحَدًا، أَحْسِبُهُ كَذَا وَكَذَا، إِنْ كَانَ يَعْلَمُ ذَلِكَ مِنْهُ.
Abu Wa'il narrated: ‘Abdullah said, “If any of you must praise his companion, let him say: ‘I think so and so is such and such, and Allah is his Reckoner. I do not assert anyone’s piety before Allah. I think him to be so and so, if he really knows that about him.’” (Bukhari 2662)