Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:27468a –
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السيوطي:٢٧٤٦٨a –

"يَا مَعْشَر الْمُسْلِمِينَ: لا صلَاةَ لِمَنْ لَا يُقيمُ صُلبَهُ فِى الرُّكُوعِ وَالسُّجُودِ".  

[هـ] ابن ماجة [طب] الطبرانى في الكبير عن على بن شيبان الحنفى

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Collected by Bayhaqī
bayhaqi:2570 – Abū Zakariyyā Yaḥyá b. Ibrāhīm b. Yaḥyá > Aḥmad b. Salmān al-Faqīh > al-Ḥasan b. Sallām > ʿUbaydullāh b. Mūsá > al-Aʿmash > ʿUmārah b. ʿUmayr > Abū Maʿmar > Abū Masʿūd

“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)   

البيهقي:٢٥٧٠ – وَأَخْبَرَنَا أَبُو زَكَرِيَّا يَحْيَى بْنُ إِبْرَاهِيمَ بْنِ يَحْيَى أنبأ أَحْمَدُ بْنُ سَلْمَانَ الْفَقِيهُ ثنا الْحَسَنُ بْنُ سَلَّامٍ ثنا عُبَيْدُ اللهِ بْنُ مُوسَى أنبأ الْأَعْمَشُ عَنْ عُمَارَةَ بْنِ عُمَيْرٍ عَنْ أَبِي مَعْمَرٍ عَنْ أَبِي مَسْعُودٍ قَالَ

قَالَ رَسُولُ اللهِ ﷺ لَا يُجْزِي صَلَاةٌ لَا يُقِيمُ الرَّجُلُ صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ