This is a ḥasan ṣaḥīḥ ḥadīth, narrated through multiple chains from Abū Hurayrah, from the Prophet, peace and blessings be upon him.

Chapter 88

3816 — Ibrāhīm ibn Yaʿqūb narrated to us, saying: Ṣafwān ibn Ṣāliḥ narrated to me, saying: al-Walīd ibn Muslim narrated to us, saying: Shuʿayb ibn Abī Ḥamzah narrated to us, from Abū al-Zinād, from al-Aʿraj, from Abū Hurayrah, who said: The Messenger of Allah, peace and blessings be upon him, said: "Indeed, Allah has ninety-nine names — one hundred minus one. Whoever enumerates them will enter Paradise. He is Allah, besides whom there is no god: the Most Merciful, the Especially Merciful, the Sovereign, the Holy, the Peace, the Giver of Faith, the Protector, the Mighty, the Compeller, the Supreme, the Creator, the Originator, the Fashioner, the Oft-Forgiving, the Subduer, the Bestower, the Provider, the Opener, the All-Knowing, the Withholder, the Extender, the Abaser, the Exalter, the Honorer, the Humiliator, the All-Hearing, the All-Seeing, the Judge, the Just, the Subtle, the All-Aware, the Forbearing, the Magnificent, the Oft-Forgiving, the Appreciative, the Most High, the Great, the Preserver, the Sustainer, the Reckoner, the Majestic, the Generous, the Watchful, the Responsive, the All-Encompassing, the Wise, the Loving, the Glorious, the Resurrector, the Witness, the Truth, the Trustee, the Strong, the Firm, the Ally, the Praiseworthy, the Counter, the Originator, the Restorer, the Giver of Life, the Taker of Life, the Ever-Living, the Self-Sustaining, the Finder, the Noble, the One, the Eternal Refuge, the Capable, the Omnipotent, the Foremost, the Deferrer, the First, the Last, the Manifest, the Hidden, the Governor, the Most Exalted, the Most Kind, the Acceptor of Repentance, the Avenger."