وَالِاسْتِحَاضَةُ دَمٌ نَقَصَ عَنْ ثَلَاثَةِ أَيَّامٍ أَوْ زَادَ عَلَى عَشَرَةٍ فِي الْحَيْضِ وَعَلَى أَرْبَعِينَ فِي النِّفَاسِ
Istihadah is bleeding outside the legal limits of Hayd/Nifas. The source also excludes pregnancy bleeding from the definition of Hayd, so pregnancy bleeding is treated under Istihadah rather than Hayd. When bleeding exceeds a maximum and the woman has an established habit, the habit rules determine which earlier portion counts as Hayd/Nifas.
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Nifas, Istihadah, and the Rules of the Excused Person
وَالِاسْتِحَاضَةُ دَمٌ نَقَصَ عَنْ ثَلَاثَةِ أَيَّامٍ أَوْ زَادَ عَلَى عَشَرَةٍ فِي الْحَيْضِ وَعَلَى أَرْبَعِينَ فِي النِّفَاسِ
Istihadah is bleeding outside the legal limits of Hayd/Nifas. The source also excludes pregnancy bleeding from the definition of Hayd, so pregnancy bleeding is treated under Istihadah rather than Hayd. When bleeding exceeds a maximum and the woman has an established habit, the habit rules determine which earlier portion counts as Hayd/Nifas.