(a) Hisham bin Urwah narrated with the same chain a narration of the same meaning: "When it has gone, take a ritual bath and pray," or he said: "Wash the blood off yourself and pray." (b) It has also been narrated with the addition: "Perform ablution for every prayer," but this is not preserved. Abu Usamah narrated it from Hisham, mentioning the ritual bath in it, except that he contradicted the group of narrators in its wording, and in the report there is an indication that he was doubtful about it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحيض / 1556