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:40:30 –

And he who believed said, "O my people, indeed I fear for you ˹a fate˺ like the day of the companies -  

Then said he who believed, ‘O my people! Truly I fear for you ˹a day˺ like the day of the factions, in other words, the day of one faction ˹being destroyed˺ after another;
القرآن:٤٠:٣٠ –

وَقَالَ الَّذِي آمَنَ يَا قَوْمِ إِنِّي أَخَافُ عَلَيْكُمْ مِثْلَ يَوْمِ الْأَحْزَابِ  

{وقال الذي آمن يا قوم إنِّي أخاف عليكم مثل يوم الأحزاب} أي يوم حزب بعد حزب.