(133) باب الْمَرْأَةِ تَغْسِلُ ثَوْبَهَا الَّذِي تَلْبَسُهُ فِي حَيْضِهَا
Abu Hurairah reported that Khawlah daughter of Yasar came to the Prophet (ﷺ) and said:
Messenger of Allah, I have only one clothe and I menstruate in it, how should I do ? He said: When you are purified, wash it and pray in it. She asked: If the blood is not removed, (then what) ? He said: It is enough for you to wash the blood, its mark will not do any harm to you.
Reference: Sunan Abi Dawud 365
In-book reference: Book 1, Hadith 365
English translation: Book 1, Hadith 365