Blog - Rojat site Hadith-The era of the appearance of Imam Mahdi (Ajal allahu taala farajaho shareef) in the words of the Rasoolullah Hazrat Muhammad (Sall-allahu Alayhi Wa Aalihi Wa Sallam)

اَلْمَهْدِيُّ يَمْلَأُهَا قِسْطاً وَ عَدْلاً كَمَا مُلِئَتْ جَوْراً وَ ظُلْماً وَ اَلَّذِي بَعَثَنِي بِالْحَقِّ نَبِيّاً لَوْ لَمْ يَبْقَ مِنَ اَلدُّنْيَا إِلاَّ يَوْمٌ وَاحِدٌ لَأَطَالَ اَللَّهُ ذَلِكَ اَلْيَوْمَ حَتَّى يَخْرُجَ فِيهِ وَلَدِي اَلْمَهْدِيُّ فَيَنْزِلَ رُوحُ اَللَّهِ عِيسَى اِبْنُ مَرْيَمَ عَلَيْهِ السَّلاَمُ فَيُصَلِّيَ خَلْفَهُ وَ تُشْرِقَ اَلْأَرْضُ بِنُورِ رَبِّهٰا وَ يَبْلُغَ سُلْطَانُهُ اَلْمَشْرِقَ وَ اَلْمَغْرِبَ . Mahdi (peace be upon him), my grandson, will fill the earth with justice and equity when it would be fraught with injustice and oppression. By the One in Whose hands is my life, even if a day remains for the earth (until resurrection), the Almighty Allah will prolong this day till Mahdi (peace be upon him) reappears. And Jesus Christ (peace be upon him) descends to the earth and recites prayer behind his eminence. and the light of the Allah shines on the earth and his authority shall reach the east and the west.

Bihar al-Anwar, Vol 51, page 71