Musannaf Ibn Abi Shayba 9:1069

Ghundar narrated to us, from Sa’id, from Qatadah, from Ibn al-Musayyib and al-Hasan regarding the woman experiencing prolonged non-menstrual bleeding (mustahadah): She fasts, prays, performs the rites (of Hajj), and her husband may have intercourse with her.