Sahih Muslim 1056
صحيح مسلم#1056SahihAnas b. Malik reported the Messenger of Allah (ﷺ) having said:When I begin the prayer I Intend to make it long, but I hear a boy cry. ing; I then shorten it because of his mother's feelings
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: 4:218