اختلفوا في وطء الحائض في طهرها وقبل الاغتسال فذهب مالك والشافعي والجمهور إلى أن ذلك لا يجوز حتى تغتسل وذهب أبو حنيفة وأصحابه إلى أن ذلك جائز إذا طهرت لأكثر أمد الحيض وهو عنده عشرة أيام وذهب الأوزاعي إلى أنها إن غسلت فرجها بالماء جاز وطؤها
بداية المجتهد ونهاية المقتصد لإبن رشد كتاب الطهارة من الحدث
There is disagreement regarding intercourse with menstruating women, once she has become pure [of menstruation], but before she has bathed [ghusl]. Malik, Al-Shafi’i, and the majority held that this is not permissible until she bathes, but Abu Hanifa and his companions held that this is permissible whenever she becomes pure for the maximum duration of menstruation, which for him is ten days. Al-Awza’i held that if the woman washes her vagina with water it is permissible to have intercourse with her.
Ibn Rushd, Bidaya Al-mujtahid wa Nihaya Al-Muqtasid [Primer for the Deducers and Resolution for the Moderate], The book of purification from bodily occurrences [hadath]