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.
hakim:8670Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Muḥammad b. Isḥāq al-Ṣaghānī > ʿAmr b. ʿĀṣim al-Kilābī > ʿImrān al-Qaṭṭān > Qatādah > Abū Naḍrah > Abū Saʿīd

[Machine] The Messenger of Allah ﷺ said, "The Mahdi is from us, the people of the household. He has a prominent nose and a broad forehead. He will fill the earth with justice and fairness just as it was filled with oppression and injustice. He will live like this." And he extended his left hand with two fingers from his right hand, the thumb and three fingers.  

الحاكم:٨٦٧٠حَدَّثَنَا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ ثَنَا مُحَمَّدُ بْنُ إِسْحَاقَ الصَّغَانِيُّ ثَنَا عَمْرُو بْنُ عَاصِمٍ الْكِلَابِيُّ ثَنَا عِمْرَانُ الْقَطَّانُ ثَنَا قَتَادَةُ عَنْ أَبِي نَضْرَةَ عَنْ أَبِي سَعِيدٍ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ «الْمَهْدِيُّ مِنَّا أَهْلَ الْبَيْتِ أَشَمُّ الْأَنْفِ أَقْنَى أَجْلَى يَمْلَأُ الْأَرْضَ قِسْطًا وَعَدْلًا كَمَا مُلِئَتْ جَوْرًا وَظُلْمًا يَعِيشُ هَكَذَا» وَبَسَطَ يَسَارَهُ وَإِصْبَعَيْنِ مِنْ يَمِينِهِ الْمُسَبِّحَةَ وَالْإِبْهَامَ وَعَقَدَ ثَلَاثَةً  

«هَذَا حَدِيثٌ صَحِيحٌ عَلَى شَرْطِ مُسْلِمٍ وَلَمْ يُخْرِجَاهُ» عمران ضعيف ولم يخرج له مسلم

See similar narrations below:

Collected by Abū Dāwūd, Suyūṭī

Description of the Mahdī's facial features

abudawud:4285Sahl b. Tammām b. Bazīʿ > ʿImrān al-Qaṭṭān > Qatādah > Abū Naḍrah > Abū Saʿīd al-Khudrī

The Prophet ﷺ said: The Mahdi will be of my stock, and will have a broad forehead a prominent nose. He will fill the earth will equity and justice as it was filled with oppression and tyranny, and he will rule for seven years.  

أبو داود:٤٢٨٥حَدَّثَنَا سَهْلُ بْنُ تَمَّامِ بْنِ بَزِيعٍ حَدَّثَنَا عِمْرَانُ الْقَطَّانُ عَنْ قَتَادَةَ عَنْ أَبِي نَضْرَةَ عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ الْمَهْدِيُّ مِنِّي أَجْلَى الْجَبْهَةِ أَقْنَى الأَنْفِ يَمْلأُ الأَرْضَ قِسْطًا وَعَدْلاً كَمَا مُلِئَتْ جَوْرًا وَظُلْمًا يَمْلِكُ سَبْعَ سِنِينَ  

suyuti:11966a
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السيوطي:١١٩٦٦a

"المَهْدِيُّ مِنِّي، أجْلَي الجَبْهة، أَقْنا الأَنف، يملأُ الأَرْضَ قِسْطًا وَعَدْلًا كَما مُلِئَت جَوْرًا وَظُلمًا يملِكُ سَبعَ سنين".  

[د] أبو داود [ك] الحاكم في المستدرك عن أَبي سعيد