Sahih Muslim 1912
صحيح مسلم#1912SahihShaqiq reported:A person from Banu Bajila who was called Nabik b. Sinan came to Abdullah and said: I recite mufassal surahs in one rak'ah. Upon this 'Abdullah said: (You recite) like the recitation of poetry. I know the manner in which the Messenger of Allah (ﷺ) recited two surahs in one rak'ah
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: 6:340