Sahih Muslim 213
صحيح مسلم#213SahihUqba b. Mukarram al-'Ami reported that he heard 'Ala' b. 'Abdur-Rahman narrating this hadith with this chain of transmitters and he said:Three are the signs of a hypocrite, even if he observed fast and prayed and asserted that he was a Muslim
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: 1:119