Imam Jafar Sadiq (a.s.): On the Day of Judgment an announcer would announce: Where are the Shias of the Progeny of Muhammad (s.a.w.s.)?
Then a large group of people whom none except Allah can count would arise and stand on one side.
Then the caller would call: Where are the visitors to the grave of Imam Husain (a.s.)? A large group would rise.
They would be told: Take the hand of anyone you like and take him to Paradise. Thus each of them would take the hand of one he likes in such a way that one of them would say: Do you not recognize me? I am the one who on such and such day at such and such time stood up for you. Thus he would take him to Paradise and not turn him down.”
Behaar al-Anwaar v 101 p 27