Twenty Years of Weeping of Imam Sajjad (a.s.)

Imam Jafar as-Sadiq (a.s.) said:

Ali Ibn al‑Husayn (A.S.) cried (over Husayn (a.s.)) for twenty years, never would any food be placed before him except that he would begin to weep.

Bihar al Anwar, vol 46, pg. 108