(Regarding someone who goes for pilgrimage to the shrine of Imam Husain (A.S.)), Imam Sadiq (A.S.) said:
One who weeps for Imam Husain (A.S.), surely, the Imam (A.S.) observes him and seeks forgiveness for him and requests his holy fathers to (also) seek forgiveness for him.
Bihar al‑Anwar vol. 44, pg. 181