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
bukhari:4919 – Ādam > al-Layth > Khālid b. Yazīd > Saʿīd b. Abū Hilāl > Zayd b. Aslam > ʿAṭāʾ b. Yasār > Abū Saʿīd

I heard the Prophet ﷺ saying, "Our Lord will lay bare His Shin, and then all the Believers, men and women, will prostrate themselves before Him, but there will remain those who used to prostrate in the world for showing off and for gaining good reputation. Such people will try to prostrate (on the Day of Judgment), but their backs will be as stiff as if it is one bone (a single vertebra).  

البخاري:٤٩١٩ – حَدَّثَنَا آدَمُ حَدَّثَنَا اللَّيْثُ عَنْ خَالِدِ بْنِ يَزِيدَ عَنْ سَعِيدِ بْنِ أَبِي هِلاَلٍ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ عَطَاءِ بْنِ يَسَارٍ عَنْ أَبِي سَعِيدٍ ؓ قَالَ

سَمِعْتُ النَّبِيَّ ﷺ يَقُولُ: «يَكْشِفُ رَبُّنَا عَنْ سَاقِهِ فَيَسْجُدُ لَهُ كُلُّ مُؤْمِنٍ وَمُؤْمِنَةٍ وَيَبْقَى مَنْ كَانَ يَسْجُدُ فِي الدُّنْيَا رِئَاءً وَسُمْعَةً فَيَذْهَبُ لِيَسْجُدَ فَيَعُودُ ظَهْرُهُ طَبَقًا وَاحِدًا۔»  

See similar narrations below:

Collected by Qurʾān
quran:68:42 –

The Day the shin will be uncovered and they will be invited to prostration but they will not be able,  

Mention, the day when the shank is bared (an expression denoting the severity of the predicament during the reckoning and the requital on the Day of Resurrection: one says kashafati’l-harbu ‘an sāqin, ‘the war has bared its shank’, to mean that it has intensified) and they are summoned to prostrate themselves, as a test of their faith, but they will not be able ˹to do so˺ — their backs will become as ˹stiff as˺ a brick wall.
القرآن:٦٨:٤٢ –

يَوْمَ يُكْشَفُ عَنْ سَاقٍ وَيُدْعَوْنَ إِلَى السُّجُودِ فَلَا يَسْتَطِيعُونَ  

اذكر {يوم يكشف عن ساق} هو عبارة عن شدة الأمر يوم القيامة للحساب والجزاء، يقال: كشفت الحرب عن ساق: إذا اشتد الأمر فيها {ويدعوْن إلى السجود} امتحاناً لإيمانهم {فلا يستطيعون} تصير ظهورهم طبقاً واحداً.
quran:68:43 –

Their eyes humbled, humiliation will cover them. And they used to be invited to prostration while they were sound.  

With humbled (khāshi‘atan is a circumstantial qualifier referring to the person ˹of the verb˺ yud‘awna, ‘they are summoned’) that is to say, with abject, gazes, which they do not raise, they will be overcast, enveloped, by abasement; for they had indeed been summoned, in this world, to prostrate themselves while they were yet sound, but they never used to do it, by the fact that they never performed prayer.
القرآن:٦٨:٤٣ –

خَاشِعَةً أَبْصَارُهُمْ تَرْهَقُهُمْ ذِلَّةٌ ۖ وَقَدْ كَانُوا يُدْعَوْنَ إِلَى السُّجُودِ وَهُمْ سَالِمُونَ  

{خاشعة} حال من ضمير يدعون، أي ذليلة {أبصارهم} لا يرفعونها {ترهقهم} تغشاهم {ذلة وقد كانوا يدعوْن} في الدنيا {إلى السجود وهم سالمون} فلا يأتون به بأن لا يصلوا.