Jami` at-Tirmidhi 3508
جامع الترمذي#3508SahihAbu Hurairah narrated that the Prophet said:“Indeed, Allah has ninety-nine Names, whoever counts them shall enter Paradise.”
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih Bukhari
In-book reference: 48:139