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:1887a –
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السيوطي:١٨٨٧a –

"إِذَا رأيتُمَ الرَّاياتِ السُّودَ قَدْ جاءتْ مِن قِبَلِ خُراسانَ فأتُوها فإِنَّ فِيهَا خَليفَةَ اللهِ المهْدِيَّ" .  

[حم] أحمد [ك] الحاكم في المستدرك عن ثوبان

See similar narrations below:

Collected by Aḥmad, Ḥākim
ahmad:22387 – Wakīʿ > Sharīk > ʿAlī b. Zayd > Abū Qilābah > Thawbān

[Machine] The Messenger of Allah ﷺ said, "When you see the black flags coming from the direction of Khorasan, then go to them, for in them is the Caliphate of Allah, the Mahdi."  

أحمد:٢٢٣٨٧ – حَدَّثَنَا وَكِيعٌ عَنْ شَرِيكٍ عَنْ عَلِيِّ بْنِ زَيْدٍ عَنْ أَبِي قِلَابَةَ عَنْ ثَوْبَانَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ إِذَا رَأَيْتُمُ الرَّايَاتِ السُّودَ قَدْ جَاءَتْ مِنْ قِبَلِ خُرَاسَانَ فَأْتُوهَا؛ فَإِنَّ فِيهَا خَلِيفَةَ اللهِ الْمَهْدِيَّ  

hakim:8531 – al-Ḥusayn b. Yaʿqūb b. Yūsuf al-ʿAdl > Yaḥyá b. Abū Ṭālib > ʿAbd al-Wahhāb b. ʿAṭāʾ > Khālid al-Ḥadhhāʾ > Abū Qilābah > Abū Asmāʾ > Thawbān > Idhā

[Machine] "When you see the black flags coming from Khorasan, then go to them, even if you have to crawl, because among them is the Caliph of Allah, the Mahdi."  

الحاكم:٨٥٣١ – أَخْبَرَنَا الْحُسَيْنُ بْنُ يَعْقُوبَ بْنِ يُوسُفَ الْعَدْلُ ثَنَا يَحْيَى بْنُ أَبِي طَالِبٍ ثَنَا عَبْدُ الْوَهَّابِ بْنُ عَطَاءٍ أَنْبَأَ خَالِدٌ الْحَذَّاءُ عَنْ أَبِي قِلَابَةَ عَنْ أَبِي أَسْمَاءَ عَنْ ثَوْبَانَ قَالَ

«إِذَا رَأَيْتُمُ الرَّايَاتِ السُّودَ خَرَجَتْ مِنْ قِبَلِ خُرَاسَانَ فَأْتُوهَا وَلَوْ حَبْوًا فَإِنَّ فِيهَا خَلِيفَةَ اللَّهِ الْمَهْدِيَّ»  

هَذَا حَدِيثٌ صَحِيحٌ عَلَى شَرْطِ الشَّيْخَيْنِ وَلَمْ يُخْرِجَاهُ