From Imam Jaffar:

"Compared with other works, SPENDING ONE DIRHAM FOR THE IMAM OF TIME (HAZRAT MAHDI (AS)) WILL BE THE EQUIVALENT OF SPENDING 2 MILLION DIRHAMS (FOR OTHER REASONS). Pray for his coming. There is no doubt that this is for our own good. If someone does not regard the life of the Messenger of Allah as more preferable than his own, then he is not a true believer, nor if he does not regard the line of our Prophet (saas) as more beloved than his own family nor, finally, if he also does not regard as important the things as our Prophet (saas) considered important."
(Sheikh Sadik, Al Amal, p. 274; Majlisi54; Al-Haq, Vol. 9; pp. 392-393)