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.