Through this chain of narration, from Sa’d ibn Abdullah, from Ahmad ibn Muhammad, from al-Qasim, from Ali, who said: I asked Abu Abdullah عليه السلام about the ghusl on the two Eids. Is it obligatory? Imam عليه السلام said: "It is a sunnah." I asked: "And what about the ghusl on Friday?" Imam عليه السلام said: "It is a sunnah."