Hadithcore
Mishkat al-Masabih, 2287

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 <i>ahsaha</i>, 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.)

عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِنَّ لِلَّهِ تَعَالَى تِسْعَةً وَتِسْعِينَ اسْمًا مِائَةً إِلَّا وَاحِدًا مَنْ أَحْصَاهَا دَخَلَ الْجَنَّةَ» . وَفِي رِوَايَة: «وَهُوَ وتر يحب الْوتر»

References1 variant
In-Book Reference
Book 9, Hadith 61