Narrated Wabisah bin Ma'bad:

Allah's Messenger (ﷺ) 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)].

وَعَنْ وَابِصَةَ بْنِ مَعْبَدٍ ]اَلْجُهَنِيِّ] ‏- رضى الله عنه ‏- أَنَّ رَسُولَ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ رَأَى رَجُلًا يُصَلِّي خَلْفَ اَلصَّفِّ وَحْدَهُ, فَأَمَرَهُ أَنْ يُعِيدَ اَلصَّلَاةَ.‏ } رَوَاهُ أَحْمَدُ, وَأَبُو دَاوُدَ, وَاَلتِّرْمِذِيُّ وَحَسَّنَهُ, وَصَحَّحَهُ اِبْنُ حِبَّانَ .‏ [1]‏ .‏