Ahmad ibn Muhammad ibn Isa, from Muhammad ibn Abdillah and Abdillah ibn al-Mughirah, from Abu al-Hasan al-Ridha عليه السلام, peace be upon him, who said: I asked Imam عليه السلام about the ghusl on the day of Friday. Imam عليه السلام said: “It is obligatory upon every male and female, whether slave or free.”