Sunan Ibn Majah 966
سنن ابن ماجه#966Da'ifIt was narrated that Abu Hurairah said:“The Messenger of Allah (ﷺ) forbade a man to cover his mouth during the prayer.”
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
Shuaib Al ArnautDaif
Zubair Ali ZaiDaif
In-book reference: 5:164