Sunan Ibn Majah 959
سنن ابن ماجه#959HasanIt was narrated that Ibn ‘Abbas said:“The Messenger of Allah (ﷺ) forbade performing prayer behind one who is engaged in conversation or one who is sleeping.”
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan
Muhammad Fouad Abd al-BaqiHasan
Zubair Ali ZaiHasan
In-book reference: 5:157