Inter-period bleeding
مُحَمَّدُ بْنُ إِسْمَاعِيلَ عَنِ الْفَضْلِ بْنِ شَاذَانَ عَنْ حَمَّادِ بْنِ عِيسَى وَ ابْنِ أَبِي عُمَيْرٍ جَمِيعاً عَنْ مُعَاوِيَةَ بْنِ عَمَّارٍ قَالَ قَالَ أَبُو عَبْدِ اللَّهِ ( عليه السلام ) إِنَّ دَمَ الِاسْتِحَاضَةِ وَ الْحَيْضِ لَيْسَ يَخْرُجَانِ مِنْ مَكَانٍ وَاحِدٍ إِنَّ دَمَ الِاسْتِحَاضَةِ بَارِدٌ وَ دَمَ الْحَيْضِ حَارٌّ
Muhammad Bin Ismail, from Al Fazl Bin Shazaan, from Hammad Bin Isa and Ibn Abu Umeyr, altogether from Muawiya Bin Ammar who said,
‘Abu Abdullah-asws said: ‘The blood of the inter-period bleeding (Istihaaza) and the menstruation (Haydh) do not come out from one place. The blood of the inter-period bleeding (Istihaaza) is cold, and the blood of the menstruation (Haydh) is hot’.[1]
[1] Al Kafi – V 3 – The Book of Menstruation (Haydh) Ch 10 H 2