Sunan Ibn Majah 3860
سنن ابن ماجه#3860SahihIt was narrated from Abu Hurairah that :the Messenger of Allah (saas) said: "Allah has ninety-nine Names, one hundred less one. Whoever counts them will enter Paradise
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan Sahih
Muhammad Fouad Abd al-BaqiHasan Sahih
Shuaib Al ArnautHasan
Zubair Ali ZaiIsnaad Hasan
In-book reference: 34:34