Sahih Muslim 1454
صحيح مسلم#1454SahihJabir b. Samura reported:The Messenger of Allah (ﷺ) used to observe prayers like your prayers, but he would delay the prayer after nightfall to a little after the time you observed it, and he would shorten the prayer
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: 5:287