Sahih Muslim 325
صحيح مسلم#325SahihIt is narrate on the authority of Hakim b. Hizam:I said: Messenger of Allah, I did so some of the deeds in the state of ignorance. (One of the transmitters Hisham b. Urwa explained them as acts of piety. Upon this the Messenger, of Allah remarked: You have embraced Islam with all the previous acts of virtue. I said: By God, I would leave nothing undone in Islam the like of which I did in the state of ignorance)
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: 1:232