Sunan an-Nasa'i #367 · The Book of Menstruation and Istihadah

Sunan an-Nasa'iIt was narrated from 'Aishah that the daughter of Abu Hubaish said
Sunan an-Nasa'i · Book 3 · The Book of Menstruation and Istihadah
Sunan an-Nasa'i · كتاب 3 · كتاب الحيض والاستحاضة
"O Messenger of Allah, I do not become pure, so should I stop praying? He said: "no, that is a vein." - (One of the narrators) Khalid said, in what I read from him - "and it is not menstruation, so when your period comes, stop praying, and when it goes, wash the blood from yourself and pray
أَخْبَرَنَا أَبُو الأَشْعَثِ، قَالَ حَدَّثَنَا خَالِدُ بْنُ الْحَارِثِ، قَالَ سَمِعْتُ هِشَامًا، يُحَدِّثُ عَنْ أَبِيهِ، عَنْ عَائِشَةَ، أَنَّ بِنْتَ أَبِي حُبَيْشٍ، قَالَتْ يَا رَسُولَ اللَّهِ إِنِّي لاَ أَطْهُرُ أَفَأَتْرُكُ الصَّلاَةَ قَالَ ‏
"‏ لاَ إِنَّمَا هُوَ عِرْقٌ ‏"‏ ‏.‏ قَالَ خَالِدٌ وَفِيمَا قَرَأْتُ عَلَيْهِ ‏"‏ وَلَيْسَتْ بِالْحِيضَةِ فَإِذَا أَقْبَلَتِ الْحِيضَةُ فَدَعِي الصَّلاَةَ وَإِذَا أَدْبَرَتْ فَاغْسِلِي عَنْكِ الدَّمَ ثُمَّ صَلِّي ‏"‏ ‏.‏
Reference : Sunan an-Nasa'i 367In-book reference : Book 3, Hadith 19