The Book of Purification
1/135. Chapter:
Mentioning The Period
Sunan an-Nasai
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنِ ابْنِ شِهَابٍ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ، قَالَتِ اسْتَفْتَتْ أُمُّ حَبِيبَةَ بِنْتُ جَحْشٍ رَسُولَ اللَّهِ صلى الله عليه وسلم فَقَالَتْ يَا رَسُولَ اللَّهِ إِنِّي أُسْتَحَاضُ . فَقَالَ " إِنَّمَا ذَلِكِ عِرْقٌ فَاغْتَسِلِي وَصَلِّي " . فَكَانَتْ تَغْتَسِلُ لِكُلِّ صَلاَةٍ .
It was narrated that 'Aishah said: "Umm Habibah bint Jahsh consulted the Messenger of Allah (ﷺ) and said: 'O Messenger of Allah, I suffer from Istihadah (non-menstrual vaginal bleeding).' He said: 'That is a vein, so perform Ghusl and pray.' And she used to perform Ghusl for every prayer."
Reference : Sunan an-Nasa'i 206In-book reference : Book 1, Hadith 207English translation : Vol. 1, Book 1, Hadith 206