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:17971a –
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السيوطي:١٧٩٧١a –

"لَوْ لَمْ يَبْقَ مِنَ الدَّهْرِ إلا يَوْمٌ لَبَعَثَ الله رَجَلًا مِنْ أهْلِ بَيتِى يَملَؤُهَا عَدْلًا، كَمَا مُلِئَتْ جَوْرًا".  

[حم] أحمد [د] أبو داود عن علي

See similar narrations below:

Collected by Abū Dāwūd, Suyūṭī

The Mahdī will be from the Prophetic lineage and will fill the earth with justice

abudawud:4283 – ʿUthmān b. Abū Shaybah > al-Faḍl b. Dukayn > Fiṭr > al-Qāsim b. Abū Bazzah > Abū al-Ṭufayl > ʿAlī Rḍá Allāh Tʿālá ʿNh

The Prophet ﷺ said: "If only one day of this ˹worldly˺ time remained, Allah would raise up a man (the Mahdī) from my family who would fill this earth with justice as it has been filled with oppression."  

أبو داود:٤٢٨٣ – حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ حَدَّثَنَا الْفَضْلُ بْنُ دُكَيْنٍ حَدَّثَنَا فِطْرٌ عَنِ الْقَاسِمِ بْنِ أَبِي بَزَّةَ عَنْ أَبِي الطُّفَيْلِ عَنْ عَلِيٍّ ؓ

عَنِ النَّبِيِّ ﷺ قَالَ لَوْ لَمْ يَبْقَ مِنَ الدَّهْرِ إِلاَّ يَوْمٌ لَبَعَثَ اللَّهُ رَجُلاً مِنْ أَهْلِ بَيْتِي يَمْلأُهَا عَدْلاً كَمَا مُلِئَتْ جَوْرًا