Al-Husayn ibn Said, from Ibn Abi Najran, from Muhammad ibn Humran, who said: Abu Abdillah عليه السلام, peace be upon him, said: “The time for the prayer of ‘al-Kusuf’ (prayer of eclipse) is at the hour when the eclipse occurs, whether at sunrise or at sunset.” He (narrator) said that Abu Abdillah عليه السلام, peace be upon him, also said: “It is an obligation (faridah).”