Sahih Bukhari Volume 001, Book 006, Hadith Number 317.

Narated By 'Aisha : Fatima bint Abi Hubaish used to have bleeding in between the periods, so she asked the Prophet about it. He replied, "The bleeding is from a blood vessel and not the menses. So give up the prayers when the (real) menses begin and when it has finished, take a bath and start praying."

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