Ever since the year 260 A.H. that Hadrat Mahdi (PBUH) has been in Occultation, sincere and devoted Believers, with tearful eyes and hopeful hearts, have been Anticipating his glorious and Promised Emergence, but many passed away brokenhearted without witnessing that which they had wholeheartedly anticipated.

What about them? Those
who have been trying to sweep the dust of ignorance and
disremembrance from the alleyways of human memory so that the sweet
fragrance of Mahdi's (PBUH) remembrance may flow in human mind; those
who have been trying to wash away the dirt of hopelessness from human
heart so that the glory of love and hope may enliven human soul;
those who have been trying to remove the dark clouds of doubt and
skepticism from the horizon of human Belief so that the bright sun of
certitude may enlighten human thought; …; those whose hearts
finally stopped beating while their last heartbeat was chanting:

O'
Allah! Surely, we present our pains and sorrows to Thee: lack of our
Prophet -Thy Salawaat be upon him and his progeny-, and Occultation
of our 'wali' -Thy Salaam be upon him-, and numerousness of our
enemies, and fewness of our numbers, and severeness of trials and
conspiracies against us, and vicissitudes of time upon us.

(Eftetaah
Supplication)

While Allah has Promised
to reward in many ways, those who have Believed and Anticipated
sincerely, in the Hereafter, but He has also Promised:

Those
Believers who have died while anticipating Hadrat Mahdi's (PBUH)
Reappearance, will be brought back to life and will help him in the
achievement of his goals. When the number of his supporters and
helpers swells to ten thousand, he will announce his Movement.

(Kamaal-O-Ddin,
p.378, H. 2; …)

O' Allah! We implore You
in the Names of Mohammad and his Ahl-Ol-Bayt (May Your Salawaats be
upon them), to hasten the Emergence of their beloved Mahdi (Your
Salaam be upon him) … .