GodlyVerses

"Umm Habibah bint Jahsh- the wife of 'Abdur-Rahman bin 'Awf and the sister of Zainab bint Jahsh - suffered Istihadah (non-mentrual vaginal bleeding)." She said: "She consulted the Messenger of Allah (ﷺ) and the Messenger of Allah (ﷺ) said to her: 'That is not menstruation, rather that is a vein. When you period goes, perform Ghusl and pray, and when it comes, stop praying (for that period).'" 'Aishah said: "She used to perform Ghusl for every prayer and pray. Sometimes she would perform Ghusl in a washtub in the room of her sister Zainab when she was with the Messenger of Allah (ﷺ) and the water would turn red with blood, then she would go out and pray with the Messenger of Allah (ﷺ). That did not stop her from praying." - Hadith An Nasai 204 (islam)
Book 1, Hadith 205
Vol. 1, Book 1, Hadith 204

"O Messenger of Allah, marry my sister, the daughter of Abu Sufyan." She said: "The Messenger of Allah said: 'Would you like that?' I said: 'Yes; I do not have you all to myself and I would like to share this goodness with my sister.' The Prophet said: 'Your sister is not permissible for me (to marry).' I said: 'By Allah, O Messenger of Allah, we have been saying that you want to marry Durrah bint Abi Salamah.' He said: 'The daughter of Umm Salamah?' I said: 'Yes.' He said: 'By Allah, even if she were not my stepdaughter who is in my care, she would not be permissible for me (to marry), because she is the daughter of my brother through breast-feeding. Thuwaibah breastfed Abu Salamah and I. So do not offer your daughters or sisters to me in marriage.'" - Hadith An Nasai 3284 (islam)
Book 26, Hadith 89
Vol. 4, Book 26, Hadith 3286