Nudba means calling and/or mourning in Arabic. This supplication is used to call Imām al-Mahdī (ʿaj) for intercession, and for mourning his absence and occultation.

One of the most prominent supplications, it is attributed to Imam Jafar al-Sadiq (‘a). 

It is highly recommended to be recited on four Eids: al-Fitr, al-Adha, al-Ghadeer and Jumu’ah (Friday) after sunrise.