Abu Huraira reported God’s messenger as saying, “God had ninety-nine names, one short of a hundered. He who retains them in his memory* will enter paradise.” A version has, “And He is One. He loves what is single.” *The Arabic is ahsaha, a word which has different meanings. Besides the meaning above can mean to number, to reach the last number, to understand, to attain comprehensive knowledge. (Bukhari and Muslim.)
Hadith Referenceمشكوة المصابيح / كتاب الدعوات / 2287
Hadith Gradingالألبانی:مُتَّفَقٌ عَلَيْهِ | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (6410، 7392) و مسلم (2677/6)»