"Ziyad bin Abi Al-Ja'd took me by the hand while we were in Ar Raqqah, he made me stand before a Shaikh who was called Wabisah bin Ma'bad, from Bani Asad. Ziyad said: 'This Shaikh narrated to me that a prayed alone behind the row' - and the Shaikh was listening - 'so Messenger of Allah ordered him to repeat the Salat.'"  

أَنَّ رَجُلاً صَلَّى خَلْفَ الصَّفِّ وَحْدَهُ وَالشَّيْخُ يَسْمَعُ فَأَمَرَهُ رَسُولُ اللَّهِ ﷺ أَنْ يُعِيدَ الصَّلاَةَ  

"A man prayed alone behind the row s the Prophet ordered him to repeat the Salat."  

أَنَّ رَجُلاً صَلَّى خَلْفَ الصَّفِّ وَحْدَهُ فَأَمَرَهُ النَّبِيُّ ﷺ أَنْ يُعِيدَ الصَّلاَةَ