Sunan an-Nasa'i 394
سنن النسائي#394SahihIt was narrated from Asma' bint Abi Bakr that a woman asked the Messenger of Allah (ﷺ) about menstrual blood that gets on clothes. He said:"Scratch it, then rub it with water, then sprinkle water over it, and pray in it
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 3:47