Sahih Muslim 5986
صحيح مسلم#5986SahihA hadith like this has been transmitted on the authority, of 'Ubaidullah with this addition:Ubaidullah was asked (about these two names, i. e. Jarba' and Adhruh). He said: These are the two towns of Syria and there is between them the distance which can be covered in three nights, and the hadith transmitted on the authority of Ibn Bishr (the words are)." Three days
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: 43:47