Section: The ruling on the purity of the woman experiencing isti'hada (prolonged irregular vaginal bleeding) is like the ruling on tayammum, in that when she performs wudu' during the time of the prayer, she performs the obligatory prayer with it, then performs any missed prayers and performs supererogatory prayers until the time [for that prayer] exits. Ahmad explicitly stated this. By analogy, she may combine two prayers with one wudu'. Al-Shafi'i said: She may not combine two obligatory prayers with one state of purity, nor may she perform missed prayers with it, nor combine two prayers, following his view on tayammum. Al-Khiraqi’s statement may also be interpreted this way, due to his saying: "For every prayer." Their proof is the statement of the Prophet, peace and blessings of Allah be upon him: "Perform wudu' for every prayer." Our proof is that it has been narrated in some wordings of the hadith of Fatima: "Perform wudu' for the time of every prayer." Furthermore, it is a wudu' that permits supererogatory acts, so it permits obligatory ones, just like the wudu' of a woman who is not experiencing isti'hada. Their hadith is interpreted as referring to the time, like the saying of the Prophet, peace and blessings of Allah be upon him: "Wherever the prayer overtakes you, pray," meaning its time. The hadith of Hamna is manifest in allowing the combination of two prayers with one wudu', and because he did not command her to perform wudu' between them, and this is a matter that is obscure and requires clarification, and it is not permissible to delay a clarification past the time it is needed.

Section: It is narrated from Ahmad, may Allah have mercy on him, that he said: There is no harm if a woman drinks medicine that stops her menstruation, if it is a well-known medicine.