[Machine] The Prophet ﷺ noticed a man praying alone behind the rows, so he commanded him to repeat the prayer like this.  

أَنَّ النَّبِيَّ ﷺ أَبْصَرَ رَجُلًا يُصَلِّي خَلْفَ الصَّفِّ وَحْدَهُ فَأَمَرَهُ أَنْ يُعِيدَ الصَّلَاةَ هَكَذَا  

"A man prayed alone behind the row s the Prophet ordered him to repeat the Salat." (Using translation from Tirmidhī 231)   

أَنَّ النَّبِيَّ ﷺ رَأَى رَجُلًا يُصَلِّي خَلْفَ الصُّفُوفِ وَحْدَهُ فَأَمَرَهُ فَأَعَادَ الصَّلَاةَ  

[Machine] The Messenger of Allah, ﷺ , saw a man praying alone behind the row and he ordered him to repeat the prayer. His name was Waseet ibn Ma'bad al-Asadi. And so on.  

أَنَّ رَسُولَ اللهِ ﷺ رَأَى رَجُلًا يُصَلِّي خَلْفَ الصَّفِّ وَحْدَهُ فَأَمَرَهُ أَنْ يُعِيدَ وَاسْمُهُ وَابِصَةُ بْنُ مَعْبَدٍ الْأَسَدِيُّ وَكَذَلِكَ  

[Machine] A man prayed alone behind the rows, and the Prophet ﷺ commanded him to repeat the prayer, and it was narrated through a weak chain of narrators from Al-Sha'bi from Wabisah.  

أَنَّ رَجُلًا صَلَّى خَلْفَ الصُّفُوفِ وَحْدَهُ فَأَمَرَهُ النَّبِيُّ ﷺ أَنْ يُعِيدَ الصَّلَاةَ وَرُوِيَ بِإِسْنَادٍ ضَعِيفٍ عَنِ الشَّعْبِيِّ عَنْ وَابِصَةَ  

[Machine] "The Messenger of Allah ﷺ saw a man praying alone behind the rows, so he said, 'O worshipper who prays alone, haven't you prayed towards the row or did you drag a man (to pray) with you?' Then he told him to repeat the prayer, and Al-Sarri bin Isma'il narrated it, although he is weak. Abu Dawud narrated it in the Mawaqit."  

رَأَى رَسُولُ اللهِ ﷺ رَجُلًا صَلَّى خَلْفَ الصُّفُوفِ وَحْدَهُ فَقَالَ أَيُّهَا الْمُصَلِّي وَحْدَهُ أَلَا وَصَلْتَ إِلَى الصَّفِّ أَوْ جَرَرْتَ إِلَيْكَ رَجُلًا فَقَامَ مَعَكَ أَعِدِ الصَّلَاةَ تَفَرَّدَ بِهِ السَّرِيُّ بْنُ إِسْمَاعِيلَ وَهُوَ ضَعِيفٌ وَرَوَاهُ أَبُو دَاوُدَ فِي الْمَرَاسِيلِ  

[Machine] The Prophet ﷺ said, "If a person comes and does not find anyone, let him join a group and stand with them. How great is the reward of the one who stands with them." Muhammad ibn Muhammad informed us, Abu al-Hasan al-Fasawi narrated to us, Abu Ali al-Lulu'i informed us, Abu Dawud mentioned it. It has also been narrated from another perspective about the Prophet ﷺ regarding the matter of repeating (the prayer).  

قَالَ النَّبِيُّ ﷺ إِنْ جَاءَ رَجُلٌ فَلَمْ يَجِدْ أَحَدًا فَلْيَخْتَلِجْ إِلَيْهِ رَجُلًا مِنَ الصَّفِّ فَلْيَقُمْ مَعَهُ فَمَا أَعْظَمَ أَجْرَ الْمُخْتَلَجِ أَخْبَرَنَاهُ مُحَمَّدُ بْنُ مُحَمَّدٍ أنبأ أَبُو الْحَسَنِ الْفَسَوِيُّ ثنا أَبُو عَلِيٍّ اللُّؤْلُؤِيُّ أَخْبَرَنَا أَبُو دَاوُدَ فَذَكَرَهُ وَقَدْ رُوِيَ مِنْ وَجْهٍ آخَرَ عَنِ النَّبِيِّ ﷺ فِي الْأَمْرِ بِالْإِعَادَةِ  

[Machine] From his father, Ali ibn Shayban, who was one of the delegation that visited the Messenger of Allah ﷺ from the Banu Suhaym tribe, he said, "We performed prayer with the Messenger of Allah ﷺ . He glanced with the corner of his eye and saw a man who did not straighten his back during the bowing and prostration. When he finished the prayer, he said, 'O people, there is no prayer for a person who does not straighten his back during the bowing and prostration.' I also prayed with the Prophet ﷺ on another day. When he finished the prayer, there was a man behind the row praying alone. The Messenger of Allah ﷺ stood until he completed his prayer. When he finished, he said, 'Reperform your prayer, for there is no prayer for an individual behind the row.'"  

عَنْ أَبِيهِ عَلِيِّ بْنِ شَيْبَانَ وَكَانَ أَحَدَ الْوَفْدِ الَّذِينَ وَفَدُوا عَلَى رَسُولِ اللهِ ﷺ مِنْ بَنِي سُحَيْمٍ قَالَ صَلَّيْنَا مَعَ رَسُولِ اللهِ ﷺ صَلَاةً فَلَمَحَ بِمُؤَخَّرِ عَيْنَيْهِ فَرَأَى رَجُلًا لَا يُقِيمُ صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ فَلَمَّا سَلَّمَ قَالَ أَيُّهَا النَّاسُ لَا صَلَاةَ لِامْرِئٍ لَا يُقِيمُ صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ وَصَلَّيْتُ مَعَ النَّبِيِّ ﷺ يَوْمًا آخَرَ فَلَمَّا سَلَّمَ إِذَا رَجُلٌ خَلْفَ الصَّفِّ يُصَلِّي وَحْدَهُ فَقَامَ رَسُولُ اللهِ ﷺ حَتَّى قَضَى صَلَاتَهُ فَلَمَّا سَلَّمَ قَالَ أَعِدْ صَلَاتَكَ لَا صَلَاةَ لِفَرْدٍ خَلْفَ الصَّفِّ  

[Machine] And it is as if the Prophet ﷺ negated the superiority of the group and commanded them to repeat it in order to gain a surplus for themselves, and not to return to leaving the Sunnah. And Allah knows best.  

وَكَأَنَّ النَّبِيَّ ﷺ نَفَى فَضْلَ الْجَمَاعَةِ وَأَمَرَهُ بِالْإِعَادَةِ لِتَحْصُلَ لَهُ زِيَادَةٌ وَلَا يَعُودَ إِلَى تَرْكِ السُّنَّةِ وَاللهُ أَعْلَمُ