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
suyuti:3274a –
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السيوطي:٣٢٧٤a –

"أَشَدُّ النَّاسِ عَليكُم الرُّومُ، وَإنَّمَا هَلَكتُهُم مَعَ السَّاعَة" .  

[حم] أحمد عن المستورد

See similar narrations below:

Collected by Aḥmad
ahmad:18023 – Ḥasan b. Mūsá > Ibn Lahīʿah > al-Ḥārith b. Yazīd > ʿAbd al-Raḥman b. Jubayr > al-Mustawrid > Baynā > ʿInd ʿAmr b. al-ʿĀṣ > Lah

[Machine] I heard the Messenger of Allah ﷺ saying, "The Romans will be the most severe people upon you, and they have indeed perished with the Hour." So 'Umar said to him, "Did I not admonish you against something like this?"  

أحمد:١٨٠٢٣ – حَدَّثَنَا حَسَنُ بْنُ مُوسَى حَدَّثَنَا ابْنُ لَهِيعَةَ حَدَّثَنَا الْحَارِثُ بْنُ يَزِيدَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ جُبَيْرٍ أَنَّ الْمُسْتَوْرِدَ قَالَ بَيْنَا أَنَا عِنْدَ عَمْرِو بْنِ الْعَاصِ فَقُلْتُ لَهُ

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ أَشَدُّ النَّاسِ عَلَيْكُمُ الرُّومُ وَإِنَّمَا هَلَكَتُهُمْ مَعَ السَّاعَةِ فَقَالَ لَهُ عَمْرٌو أَلَمْ أَزْجُرْكَ عَنْ مِثْلِ هَذَا