[Machine] The Messenger of Allah ﷺ said, "Complete your bowing and prostration. By the One in whose hand is my soul, I certainly see you after my back when you bow and prostrate."  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ أَتِمُّوا الرُّكُوعَ وَالسُّجُودَ فَوَالَّذِي نَفْسِي بِيَدِهِ إِنِّي لَأَرَاكُمْ مِنْ بَعْدِ ظَهْرِي إِذَا مَا رَكَعْتُمْ وَسَجَدْتُمْ  

[Machine] About the Prophet ﷺ , he said, "Do not count a prayer for a man who does not maintain his back or his spine during the bowing and prostration." This is the wording of the narration of Shu'bah. And in the narration of 'Ubaidullah, "without a doubt, his back," is mentioned. And it is also narrated by 'Umara ibn 'Umair, from Abu Ma'mar, from Abu Mas'ud who said, "He (the Prophet) said-"  

عَنِ النَّبِيِّ ﷺ قَالَ لَا تُجْزِي صَلَاةٌ لِرَجُلٍ لَا يُقِيمُ صُلْبَهُ أَوْ قَالَ ظَهْرَهُ فِي الرُّكُوعِ وَالسُّجُودِ لَفْظُ حَدِيثِ شُعْبَةَ وَفِي حَدِيثِ عُبَيْدِ اللهِ صُلْبَهُ بِلَا شَكٍّ وَقَالَ عَنْ عُمَارَةَ بْنِ عُمَيْرٍ عَنْ أَبِي مَعْمَرٍ عَنْ أَبِي مَسْعُودٍ قَالَ قَالَ  

“The Messenger of Allah ﷺ said: ‘No prayer is acceptable in which a man does not settle his spine when bowing and when prostrating.’” (Using translation from Ibn Mājah 870)   

النَّبِيَّ ﷺ قَالَ لَا تُجْزِي صَلَاةٌ لَا يُقِيمُ الرَّجُلُ فِيهَا صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ  

[Machine] He came across a man who was praying but was not completing the bowing and prostrations. So he asked him, "How long have you been praying like this?" The man replied, "For forty years, or maybe it was such and such time." He said to him, "You have not prayed to God a prayer since such and such time." He said, "Mahdi (the guided one) and I believe he said, "If you were to die, you would die upon other than the Sunnah of Muhammad ﷺ."  

أَنَّهُ مَرَّ عَلَى رَجُلٍ يُصَلِّي لَا يُتِمُّ رُكُوعًا وَلَا سُجُودًا فَقَالَ لَهُ مُذْ كَمْ تُصَلِّي هَذِهِ الصَّلَاةَ؟ فَقَالَ مُنْذُ أَرْبَعِينَ سَنَةً أَوْ قَالَ مُنْذُ كَذَا وَكَذَا قَالَ مَا صَلَّيْتَ لِلَّهِ صَلَاةً مُنْذُ كَذَا وَكَذَا قَالَ مَهْدِيٌّ وَأَحْسِبُهُ قَالَ لَهُ لَوْ مُتَّ لَمُتَّ عَلَى غَيْرِ سُنَّةِ مُحَمَّدٍ ﷺ  

“The Messenger of Allah ﷺ forbade three things: Pecking like a crow, spreading (the forearms) like a beast of prey, and a man having a place in the mosque in which he usually offers the prayer, like a camel has a place to which it usually goes.” (Using translation from Ibn Mājah 1429)   

نَهَى رَسُولُ اللهِ ﷺ عَنْ ثَلَاثٍ عَنْ نَقْرَةِ الْغُرَابِ وَافْتِرَاشِ السَّبُعِ وَلَا يُوَطِّنِ الرَّجُلُ الْمَكَانَ الَّذِي يُصَلِّي فِيهِ كَمَا يُوَطِّنُ الْبَعِيرُ  

[Machine] The Messenger of Allah, ﷺ , forbade sleeping on the belly, imitating the crow's croaking sound, and a man taking up a place in prayer as a camel does.  

نَهَى رَسُولُ اللهِ ﷺ فِي الصَّلَاةِ عَنِ افْتِرَاشِ السَّبُعِ وَأَنْ يَنْقُرَ نَقْرَ الْغُرَابِ وَأَنْ يُوطِنَ الرَّجُلُ الْمَقَامَ كَمَا يُوطِنُ الْبَعِيرُ