she regains purity before the forty days because the blood has stopped, she must perform the ritual bath and resume the prayer; no minimum period is stipulated for nifās, for no text sets one. If the forty days are completed and the bleeding has not ceased, then: should the timing coincide with her normal menstrual habit, it is treated as menstruation; if it does not coincide with her habit and the bleeding continues without interruption, it is classified as istiḥāḍah (abnormal bleeding), and after the fortieth day she is not excused from any act of worship. If the blood exceeds forty days but neither continues uninterrupted nor matches a known habit, the matter is subject to scholarly disagreement.

[Legal Rulings Pertaining to Nifās]
B – The rulings of nifās are identical to those of menstruation in the following respects:

1. Vaginal intercourse with a woman in nifās is forbidden, just as it is with a menstruating woman, while every form of enjoyment short of intercourse remains permissible.
2. A woman in nifās is prohibited from fasting, performing the prayer, or circling the Kaʿbah, exactly like a menstruant.
3. She may not touch a copy of the Quran or recite it unless she fears forgetting it, as is the case for a menstruating woman.
4. She must make up the obligatory fasts missed during nifās, just as a menstruant must.
5. She is required to perform the ritual bath at the end of nifās exactly as a menstruant does. The evidence for this includes: (1) the report of Umm Salamah (may Allah be pleased with her): “During the time of the Messenger of Allah…"