[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