The Messenger of Allah (sallallahu alayhi wa sallam) saw a man praying alone behind the row so he ordered him to repeat the Salat (prayer).
وَعَنْ وَابِصَةَ بْنِ مَعْبَدٍ]اَلْجُهَنِيِّ] رضى الله عنه
أَنَّ رَسُولَ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ -«رَأَى رَجُلًا يُصَلِّي خَلْفَ اَلصَّفِّ وَحْدَهُ، فَأَمَرَهُ أَنْ يُعِيدَ اَلصَّلَاةَ»
The Messenger of Allah (sallallahu alayhi wa sallam) saw a man praying alone behind the row so he ordered him to repeat the Salat (prayer).
صحيح. رواه أحمد (4/228)، وأبو داود (682)، والترمذي (230)، وابن حبان (2198 و 2199 و 2200) وقال الترمذي: «حديث حسن». قلت: وللحديث طرق تفصيلها بالأصل
Who passed it on, from Ibn Hajar back to the one who was there.
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