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
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السيوطي:٢٥٢٦٦a –

"لاَ تَقُومُ السَّاعَةُ حَتَّى يُلتَمسَ رَجُلٌ مِنْ أَصْحَابِى كمَا تُلتمَسُ الضَّالَّةُ فَلاَ يُوجَدُ".  

[حم] أحمد عن عليٍّ

See similar narrations below:

Collected by Aḥmad
ahmad:675 – Abū Saʿīd > Isrāʾīl > Abū Isḥāq > al-Ḥārith > ʿAlī

The Messenger of Allah ﷺ said: “The Hour will not begin until one of my Companions is sought as a lost thing is sought and cannot be found.ʿ  

أحمد:٦٧٥ – حَدَّثَنَا أَبُو سَعِيدٍ حَدَّثَنَا إِسْرَائِيلُ حَدَّثَنَا أَبُو إِسْحَاقَ عَنْ الْحَارِثِ عَنِ عَلِيٍّ قَالَ

قَالَ رَسُولُ اللهِ ﷺ لَا تَقُومُ السَّاعَةُ حَتَّى يُلْتَمَسَ رَجُلٌ مِنْ أَصْحَابِي كَمَا تُلْتَمَسُ أَوْ تُبْتَغَى الضَّالَّةُ فَلا يُوجَدُ  

ahmad:720 – Khalaf b. al-Walīd > Isrāʾīl > Abū Isḥāq > al-Ḥārith > ʿAlī

The Prophet ﷺ said: ʿThe Hour will not begin until one of my Companions will be sought as a lost item is sought, but he will not be found.ʿ  

أحمد:٧٢٠ – حَدَّثَنَا خَلَفُ بْنُ الْوَلِيدِ حَدَّثَنَا إِسْرَائِيلُ عَنْ أَبِي إِسْحَاقَ عَنِ الْحَارِثِ عَنْ عَلِيٍّ قَالَ

قَالَ النَّبِيُّ ﷺ لَا تَقُومُ السَّاعَةُ حَتَّى يُلْتَمَسَ الرَّجُلُ مِنْ أَصْحَابِي كَمَا تُلْتَمَسُ الضَّالَّةُ فَلا يُوجَدُ