Sahih Muslim 3326
صحيح مسلم#3326SahihAnas b. Malik (Allah he pleased with him) reported that Allah's Messenger (ﷺ) said:O Allah, increase in Medina twice the blessings (Thou showered) on Mecca
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: 15:530