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
hakim:3845 – Abū Zakariyyā al-ʿAnbarī > al-Ḥusayn b. Muḥammad al-Qabbānī > Saʿīd b. Yaḥyá al-Umawī > ʿAbdullāh b. al-Mubārak > Usāmah b. Zayd > ʿIkrimah > Ibn ʿAbbās

that he (Ibn ʿAbbās) asked regarding ˹Allah's˺ statement ﷻ, 'The day the shin will be exposed' (Qalam 68:42), he said: 'If something is hidden from the Quran for you then seek it in poetry, for it is the dīwān (register) of the Arabs.'

As you've heard the poet saying: [..poetry omitted..], Ibn ʿAbbās said: 'This is the day of distress and severity.'  

This ḥadīth has a sound chain. This is a more appropriate ḥadith than the one narrated by Ibn Masʿūd through a sound chain, whose narration does not add significance to this topic.
الحاكم:٣٨٤٥ – حَدَّثَنَا أَبُو زَكَرِيَّا الْعَنْبَرِيُّ ثنا الْحُسَيْنُ بْنُ مُحَمَّدٍ الْقَبَّانِيُّ ثنا سَعِيدُ بْنُ يَحْيَى الْأُمَوِيُّ ثنا عَبْدُ اللَّهِ بْنُ الْمُبَارَكِ أَنْبَأَ أُسَامَةُ بْنُ زَيْدٍ عَنْ عِكْرِمَةَ عَنِ ابْنِ عَبَّاسٍ

أَنَّهُ سُئِلَ عَنْ قَوْلِهِ ﷻ {يَوْمَ يُكْشَفُ عَنْ سَاقٍ} [القلم 42] قَالَ: إِذَا خَفِي عَلَيْكُمْ شَيْءٌ مِنَ الْقُرْآنِ فَابْتَغُوهُ فِي الشِّعْرِ فَإِنَّهُ دِيوَانُ الْعَرَبِ۔

أَمَا سَمِعْتُمْ قَوْلَ الشَّاعِرِ [البحر الرجز] اصْبِرْ عَنَاقَ إِنَّهُ شَرٌّ بَاقٍ، قَدْ سَنَّ قَوْمَكَ ضَرْبُ الْأَعْنَاقْ؛ وَقَامَتِ الْحَرْبُ بِنَا عَنْ سَاقْ۔ قَالَ ابْنُ عَبَّاسٍ هَذَا يَوْمُ كَرْبٍ وَشِدَّةٍ  

هَذَا حَدِيثٌ صَحِيحُ الْإِسْنَادِ وَهُوَ أَوْلَى مِنْ حَدِيثٍ رُوِيَ عَنِ ابْنِ مَسْعُودٍ بِإِسْنَادٍ صَحِيحٍ لَمْ أَسْتَجِزْ رِوَايَتَهُ فِي هَذَا الْمَوْضِعِ صحيح

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.