Hadith 2:322
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