(10) باب الاِعْتِكَافِ لِلْمُسْتَحَاضَةِ
Narrated `Aisha:
Once one of the wives of the Prophet (ﷺ) did I`tikaf along with him and she was getting bleeding in between her periods. She used to see the blood (from her private parts) and she would perhaps put a dish under her for the blood. (The sub-narrator `Ikrima added, `Aisha once saw the liquid of safflower and said, "It looks like what so and so used to have.")
Reference: Sahih al-Bukhari 309
In-book reference: Book 6, Hadith 14
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 6, Hadith 306