Sahih Muslim 140
صحيح مسلم#140SahihIt is narrated on the authority of Ubadah b. Samit that the messenger of Allah (ﷺ) observed:He who said:" There is no god but Allah, He is One and there is no associate with Him, that Muhammad is his servant and His messenger, that Christ is servant and the son of His slave-girl and he (Christ) His word which He communicated to Mary and is His Spirit, that Paradise is a fact and Hell is a fact," Allah would make him (he who affirms these truths enter Paradise through any one of its eight doors which he would like)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 1:47