It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both): When the blood is a large amount, the prayer must be repeated; if the blood is small in amount, the prayer is not to be repeated.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4100
Hadith Gradingمحدثین:صحيح
Hadith Takhrij«صحيح۔ ابن منذر في الاوسط 1/173-2/153»