"Praying in congregation is twenty-seven times better than praying alone."
Sunan an-Nasa'i Book 10, Hadith 61
← Previous Hadith 837. It was narrated from Abu Bakr that the Prophet (ﷺ) offered the fear prayer (Salat Al-Khauf). He led those who were behind him in two Rak'ah and those who came (after them) in two Rak'ah, so the Prophet (ﷺ) prayed four Rak'ahs and each group prayed two.

Sunan an-Nasa'i Book 10, Hadith 60 Next Hadith → "Praying in congregation is twenty-five portions better than one of you praying alone."

Sunan an-Nasa'i Book 10, Hadith 62