There are ninety-nine names of Allah; he who commits them to memory would get into Paradise. Verily, Allah is Odd (He is one, and it is an odd number) and He loves odd number. And in the narration of Ibn 'Umar (the words are):" He who enumerated them."  

عَنِ النَّبِيِّ ﷺ قَالَ لِلَّهِ تِسْعَةٌ وَتِسْعُونَ اسْمًا مَنْ حَفِظَهَا دَخَلَ الْجَنَّةَ وَإِنَّ اللَّهَ وِتْرٌ يُحِبُّ الْوِتْرَ وَفِي رِوَايَةِ ابْنِ أَبِي عُمَرَ مَنْ أَحْصَاهَا  

Verily, there are ninety-nine names for Allah, i. e. hundred excepting one. He who enumerates them would get into Paradise. And Hammam has made this addition on the authority of Abu Huraira who reported it from Allah's Apostle ﷺ that he said:" He is Odd (one) and loves odd number."  

عَنِ النَّبِيِّ ﷺ قَالَ إِنَّ لِلَّهِ تِسْعَةً وَتِسْعِينَ اسْمًا مِائَةً إِلاَّ وَاحِدًا مَنْ أَحْصَاهَا دَخَلَ الْجَنَّةَ وَزَادَ هَمَّامٌ عَنْ أَبِي هُرَيْرَةَ عَنِ النَّبِيِّ ﷺ إِنَّهُ وِتْرٌ يُحِبُّ الْوِتْرَ