From him, from Mu‘awiyah ibn Hakim, from Abdullah ibn al-Mughira, from al-Husayn ibn Abi al-‘Ala, from Abu Abdullah عليه السلام, who said: Imam عليه السلام said: regarding a menstruating woman: “Her leftover water (su’r) can be drunk from, but it is not used for Wudu' (ablution)."