Sunan Abi Dawud — Purification (Kitab Al-Taharah) — Hadith No: 275
Translation
Sulaiman b. Yasar said that a man reported to him from Umm Salamah; There was a woman who had an issue of blood. And he narrated the rest of the tradition to the same effect saying; when the menstruation period is over and the time of prayer arrives, she should take a bath, as mentioned in the previous tradition