Excessively Cursing the Umayyads, openly and secretly

If there is no occasion for Taqaiyyah, fear or personal or
social constraint it is recommended to narrate the evil deeds
of Bani Umayyah and curse them from the pulpits and in
gatherings. It is one of those acts that make one eligible for
Allah's proximity.
Shaykh Sadooq writes in Khisaal that the Messenger of
Allah (s.a.w.s.) told Ali (a.s.), "O Ali! Bani Umayyah will
curse you and for each of their curse an angel will curse
them a thousand times. After his reappearance Qaem (a.s.).
will curse them for forty years."
It means that Imam-e-Zamana (a.s.) will command his
followers to curse the Bani Umayyah from every pulpit and
in every gathering through out the world. The period so
mentioned is in retaliation of the hatred propaganda
unleashed by Bani Umayyah to malign the name of Ali
(a.s.). It is the worldly punishment of the evil deeds of Bani
Ummayyah.