How a Muslim should praise another Muslim

 231. If any of you praises his companion then let him say :

'Ahsibu fulaanan wallaahu haseebuhu

I consider (such and such a person) , and Allah is his Assessor ,

wa laa 'uzakkee 'alallaahi 'ahadan

(meaning : and I cannot claim anyone to be pious before Allah) if you know of this (good character trait in the person) to be such and such (saying what he thinks is praiseworthy in that person).

Reference: Muslim 4/2296.