Sahih Muslim 2511
صحيح مسلم#2511SahihIbn 'Umar (may Allah be pleased with both of them) reported Allah's Apostle as saying:We are an unlettered people who can neither write nor count. The month is thus, and thus. folding his thumb when he said it the third time
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: 13:17