"Musa ibn Imran's wish in relation to Hujjat (as)"
The first chapter of Aqd Al- Durur quotes Salim
Ashal: " I heard Abi Ja'far Muhammad ibn Ali Al - Baqer who sying: Musa first looked only at would be granted to Al - Mahdi (as) so he said:
Dear Allah let me in his position. He was replied: Al- Mahdi is the progeny of Ahmad. Musa looked a second and third time and asked for it again and again but he faced exactly the same response each time. Though Musa ibn Imran is the prophet determined by God, was spoken to directly (And Allah spoke to Moses with [direct] speech.), sent along with nine evident sight (And We had certainly given Moses nine evident signs) and kept close (And We called him from the side of the mount at [his] right and brought him near, confiding [to him].) he still wished to have the same status and position of Hujjat (as) and asked for it three times.
Musa ibn Imran's wish is a reality which needs no hadith or narration to clear it up since only prophet Isa's wanting to pray behind Al-Mahdi (as) is enough to have such an aspiration.
Outcomes of the creation of the world, mankind and sending all prophets, Adam to Muhammad (sa), can be summarized in four cases:
a) Irradiation of God's light and brightness on the universe which is the appearance. (And the earth will shine with the light of its Lord)
b) Resuscitating the Earth by the existence of knowledge and faith. (Know that Allah gives life to the earth after its lifelessness)
c)Rightful reign and decline of falsehood which is advent. And say, "Truth has come, and falsehood has departed. Indeed is falsehood, [by nature], ever bound to depart."
d) All people's practice of justice which is the main intention of sending prophets and holy books. (We have already sent Our messengers with clear evidences and sent down with them the Scripture and the balance that the people may maintain [their affairs] in justice.) The appearance of all these things can be done by Al-Mahdi (as).
(Allah spreads justice all over the world as it is filled with oppression and cruelty) . And this is the position which all the prophets, Adam to Isa, wished for.