Musannaf Ibn Abi Shayba 1:1010

Abu Khalid al-Ahmar narrated to us, from Hajjaj, from Thabit, from Adi ibn Dinar, that Umm Husayn asked the Prophet, may Allah bless him and grant him peace, about menstrual blood that is on a garment. He said: "Scrape it with a rib, wash it with water and lotus leaves (sidr), and pray in it."