Chapter on Menstruation, Istihada (abnormal bleeding), and Nifas (postpartum bleeding)

Al-‘Abbas ibn ‘Amir narrated from Hajjaj al-Khashshab, who said: I asked Abu Abdillah عليه السلام about a man who had relations with his wife, and then she began menstruating after he finished. Should she perform a single ghusl (ritual bath) when she becomes pure, or should she perform two separate ghusls? Imam عليه السلام said: "She should perform a single ghusl when she becomes pure."