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.
suyuti:85-434bNs
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السيوطي:٨٥-٤٣٤b

"عَنْ أنسٍ قَالَ: إِنَّ الله لاَ يَنْظُرُ إِلَى مَنْ لاَ يُقِيمُ صُلبَهُ فِي الرُّكُوع والسُّجُودِ".  

ابن النجار

See similar narrations below:

Collected by Aḥmad, Suyūṭī
ahmad:24009-76ʿAbd al-Ṣamad from my father > Abū ʿAbdullāh al-Shaqarī > ʿUmar b. Jābir > ʿAbdullāh b. Badr > ʿAbd al-Raḥman b. ʿAlī from his father

[Machine] I heard the Messenger of Allah ﷺ saying, "Indeed, Allah does not look at a man who does not keep his back straight in his bowing and prostration."  

أحمد:٢٤٠٠٩-٧٦حَدَّثَنَا عَبْدُ الصَّمَدِ حَدَّثَنِي أَبِي حَدَّثَنَا أَبُو عَبْدِ اللهِ الشَّقَرِي حَدَّثَنِي عُمَرُ بْنُ جَابِرٍ عَنْ عَبْدِ اللهِ بْنِ بَدْرٍ عَنْ عَبْدِ الرَّحْمَنِ بْنِ عَلِيٍّ عَنْ أَبِيهِ قَالَ

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ إِنَّ اللهَ لَا يَنْظُرُإِلَى رَجُلٍ لَا يُقِيمُ صُلْبَهُ فِي رُكُوعِهِ وَفِي سُجُودِهِ