Hadith 6:218
Ghundar narrated to us, from Ash'ath, from al-Hasan, who said: If a person in a state of major ritual impurity (junub) dies, he said: He is washed with the washing for his major impurity, and he is washed with the washing of the dead. And likewise is his statement regarding the menstruating woman if she becomes pure and then dies before she is washed.
حدثنا غندر عن أشعث عن الحسن قال إذا مات الجنب قال يغسل غسلا لجنابته ويغسل غسل الميت وكذلك قوله في الحائض إذا طهرت ثم ماتت قبل ان تغسل