Sahih Muslim 5084
صحيح مسلم#5084SahihUqba b. 'Amir reported that Allah's Messenger (ﷺ) gave the gifts of goats to be distributed amongst his Companions. They sacrificed them, but a lamb of one year of age was left. (Someone) made a mention of that to the Messenger of Allah (ﷺ), whereupon he said:You sacrifice it
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: 35:21