He should mourn over Husayn (A.S.), weep for him and instruct the members of the house to weep for him. He should establish the mourning ceremony in the house by exhibiting lamentations and grief over him; the people should meet one another in their homes and offer condolences and consolation to each other over the calamities which befell him.

Kaamil al‑Ziyaraat pg. 175