Narrated Wabisah bin Ma'bad: Allah's Messenger ( صلی اللہ علیہ وسلم ) saw a man praying alone behind the row so he ordered him to repeat the Salat (prayer). [Reported by Ahmad, Abu Dawud and at-Tirmidhi. The latter graded it Hasan, and Ibn Hibban graded it Sahih (authentic)] . Ibn Hibban reported this from Talq [bin 'Ali (RA)] : "The prayer of a person who prays alone behind the row is not accepted. And at-Tabarani added to the narration of Wabisah, "Why did you not join them or pull back a man (to your position)?"