Description of the moment of advent of Imam Mehdi (AS) in the words of Hazrat Ali (AS).

the concept of Mahadevat and the appearance of Imam Mehdi (AS) have been described in many traditions and the quality of appearance also has been described.

As the tradition has described that the heavenly preaching person will first raise the sound and will inform about the appearance of Hazrat Imam Mehdi (as) and then Imam Mehdi (as) will put people on the wall of Kaaba and invite people to the right.

In a Hadith regarding the appearance of Imam Mehdi (as) by Amir al muminin (AS), it is said that a clear voice from the sky will came and if you are seeking the right then be attached to the family of Ahlul Bait (AS) and Imam will appear at that time.

It is to be noted that Imam Mehdi (as) advent will be first made by a clear voice from the sky, after that Imam Mahdi (as) will come back and with the wall of Ka'ba, will invite people to his appearance.