She washed semen that had gotten on the garment of the Messenger of Allah ﷺ.
حدثنا أبو معاوية حدثنا عمرو بن ميمون بن مهران عن سليمان بن يسار
أنها غسلت منيا أصاب ثوب رسول الله ﷺ
No references are available.
Its isnad is sahih. Bukhari narrated it, 1/332, no. 229, in ghusl, and Muslim, 1/239, no. 289, and Abu Dawud, 1/102, no. 373, and Tirmidhi, 1/201, no. 117, and he said, hasan sahih, and Ibn Khuzayma, no. 287.