Hadith #3505 (Jami' al-Tirmidhi)
Book: Chapters on Supplication
Narrator(s): al-Hakam bin Aban الحكم بن أبان العدني, ibn Abbas, Ikrama عكرمة, Muhammad bin 'Amr bin 'Alqama محمد بن عمرو بن علقمة, Slm bin Ja'far al-Bakrawy سلم بن جعفر البكراوي, Yahya bin Kathir bin Darham يحيى بن كثير بن درهم العنبري

“Indeed Allah has ninety-nine Names, one hundred less one, whoever counts them shall enter Paradise.”

Source: https://parallelquran.com/hadith/jami-al-tirmidhi-3505/