Volume One: 1:317: 'Aisha: Fatima bint Abi Hubaish used to have bleeding in between the periods, ...
Hadith 1:317
Narrated '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."
