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
quran:54:46 –

But the Hour is their appointment ˹for due punishment˺, and the Hour is more disastrous and more bitter.  

Nay, but the Hour is their tryst, for chastisement, and the Hour, that is, the chastisement thereat, will be more calamitous, greater in affliction, and more bitter, than the chastisement of this world.
القرآن:٥٤:٤٦ –

بَلِ السَّاعَةُ مَوْعِدُهُمْ وَالسَّاعَةُ أَدْهَىٰ وَأَمَرُّ  

{بل الساعة موعدهم} بالعذاب {والساعة} أي عذابها {أدهى} أعظم بلية {وأمر} أشد مرارة عذاب الدنيا.

See similar narrations below:

Collected by Suyūṭī
suyuti:6674a –
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السيوطي:٦٦٧٤a –

"إِنَّ عُقُوبَةَ هذه الأُمَّةِ السَّيْفُ، وموعِدهُم السَّاعَةُ، والساعةُ أَدهى وَأَمَرُّ".  

[طب] الطبرانى في الكبير عن معقل بن يسار