Sunan Ibn Majah 788
سنن ابن ماجه#788SahihIt was narrated that Abu Sa'eed Al-Khudri said:"The Messenger of Allah said: 'the prayer of a man in congregation is twenty-five levels higher than his prayer in his home
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih
In-book reference: 4:54