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The Prophet ﷺ said:
إِذَا كَانَ أَحَدُكُمْ مَادِحًا صَاحِبَهُ لاَ مَحَالَةَ فَلْيَقُلْ أَحْسِبُ فُلاَنًا وَاللَّهُ حَسِيبُهُ وَلاَ أُزَكِّي عَلَى اللَّهِ أَحَدًا أَحْسِبُهُ إِنْ كَانَ يَعْلَمُ ذَاكَ كَذَا وَكَذَا
Idha kana ahadukum madihan sahibahu la mahalata falyaqul ahsibu fulanan wallahu hasibuhu wala uzakki 'alallahi ahadan ahsibuhu in kana ya'lamu dhaka kadha wakadha
If one of you must praise his companion, let him say: “I consider so-and-so — and Allah is his Reckoner, and I do not declare anyone pure before Allah — I consider him to be such-and-such,” if he knows that of him.
Source Ṣaḥīḥ Muslim, The Book of Zuhd and Softening of Hearts — site no. 7315 Ṣaḥīḥ · Ṣaḥīḥ al-Bukhārī 2662 (similar wording) Ṣaḥīḥ
Compiler cites Muslim 4/2296 no. 3000