Who's a true Shia? Hadith 8

Zurarah narrates that Abu Abdullah(Imam Sadiq) said:

“The young boy (15) will disappear from the public sight before his rise (with
divine power)” The narrator has said, “I then asked, "Why (would
that have to take place)?” The Imam said, “He will be afraid.” (16)
He pointed out with his hand to his stomach. Then he said, “O
Zurarah, He is the one whose reappearance is expected. He is the
one whose coming to this world through birth will be doubted.
Certain people will say, “His father died without leaving any son
behind.” certain others will say, “Just before the death of his father,
his mother conceived him.” Still others will say, “He was born two
years before the death of his father.” He is the one whose
reappearance is expected. The fact is that Allah, the Most Majestic,
the Most Gracious, loves to try and test the Shia. It is in such a
condition that people of falsehood will raise doubts, O Zurarah.” The
narrator has said, “May Allah take my soul in service for your cause,
if I will be alive at the time of his rise with divine power what should
I do?” The Imam said, “O Zurarah, if you will live up to such time
then say the following prayer. “O Lord make me know You for if you
would not make me know You I will not know Your prophet. O Lord,
make me know Your Messenger, for if You would not make me know
your Messenger I will not know the one who possesses Your
authority over the creatures. O Lord make me know the one who
possesses Your authority over the creatures for if You will not make
me know him I will stray away from my religion. (17””18)

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15 Refers to the 12th Imam, Imam al-Mahdi (a.j.f)
16 Fear for the safety of religion, as he is the protector of religion.
17 Known as Dua-e-Maa’rifah.
18 Al-Kafi, 1:337