It was narrated from 'Aishah that the daughter of Abu Hubaish said:
"O Messenger of Allah, I do not become pure, so should I stop praying?" He said: "No, that is a vein." Khalid said, in what I read from him, [1] "And it is not menstruation, so when your period comes, stop praying, and when it goes, wash the blood from yourself and pray."[1] Meaning, before Hisham, from whom he narrates it.
English reference: Vol. 1, Book 1, Hadith 220
Arabic reference: Book 1, Hadith 221