It was narrated from 'Amr bin Az-Zubair that Fatimah bint Abi Hubaish told him that she came to the Messenger of Allah and complained to him about (continual) bleeding. The Messenger of Allah said to her:
"That is a vein. Look and when your period comes, do not pray, and when your period ends, then purify yourself and pray during the time between one period and the next."
Reference: Sunan an-Nasa'i 3553 In-book : Book 27, Hadith 167 English translation : Vol. 4, Book 27, Hadith 3583
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