Chapter 1: The Book of Purification
It was narrated from 'Aishah that Umm Habibah asked the Messenger of Allah (ﷺ) about bleeding. 'Aishah said: "I saw her wash tub filled with blood. The Messenger of Allah (ﷺ) said to her: 'Stop (praying) for as long as your period prevents you, then perform Ghusl.'"
(Another chain)
Sunan an-Nasa'i 207