The Characteristics of the Companions of Imam Mahdi (A.S.)

Imam Ali (a.s.) has narrated the a certain criteria to be fulfilled by individuals for allegiance to Imam Al-Asr(ajtf).  The companions will testify in front of Imam-e-Asr (a.t.f.s) to abide by the below mentioned provisions:

1. They shall never rob
2. They shall never indulge in evil actions
3. They shall never abuse any Muslim
4. They shall never kill anyone unjustly
5. They shall never humiliate anyone
6. They shall never attack anyone's house
7. They shall never hit anyone unjustly.
8. They shall never hoard gold, silver, wheat and jowar
9. They shall never consume the right of an orphan
10. They shall never bear witness without absolute surety
11. They shall never destroy a mosque
12. They shall never drink wine
13. They shall never wear silk clothes
14. They shall never obstruct anyone's path
15. They shall never spread terror on the streets
16. They shall never indulge in homosexuality 
17. They shall never hoard food grains and wheat
18. They shall be content with little. 
19. They shall be partial towards purity.
20. They would stay away from uncleanness.
21. They will enjoin good 
22. They shall forbid evil
23. They shall never wear thick clothes
24. Clay and mud will be their headrest
25. They will struggle in Allah's Way as one ought to struggle

Then Imam-e-Asr (a.t.f.s) will pledge the following:

1. He (a.t.f.s.) will travel with them.
2. Will wear the same clothes as them.
3. Will employ the same mode of transportation as them.
4. Will work as per their desire.
5. Will be happy and content with little.
6. With Allah's Help, they will fill the earth with justice and tranquility just as it would have been filled with injustice and tyranny.
7. Will worship Allah in a manner that He should be worshipped.

(Ilzaamun Nasib, pg 201, Roozgaarhaai, vol. 1, pg. 465, tradition 564, Muntakhabul Asar, pg 469)

Imam (a.t.f.s.) will take allegiance from his companions on these criteria (mentioned earlier) and once the companions fulfill the criteria, then Imam (a.t.f.s.) will remain with them and spend his life alongside them. This highlights the intense love and affection of Imam (a.t.f.s.) for his companions.

Ref:http://www.imamreza.net/eng/imamreza.php?id=4815