Sahih Muslim 324
صحيح مسلم#324SahihHakim b. Hizam reported to 'Urwa b. Zubair that he said to the Messenger of Allah (ﷺ):Messenger of Allah, do you think if there is any reward (of the Lord with me on the Day of Resurrection) for the deeds of religious purification that I performed in the state of ignorance, such as charity, freeing a slave, cementing of blood-relations? Upon this he (the Messenger of Allah) said to him: You have accepted Islam with all the previous virtues that you had practised
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: 1:231