Sayyidah Khawlah bint Nimar (may Allah be pleased with her) said: I said: O Messenger of Allah! I have only one garment; I menstruate and blood gets on it? He (peace and blessings be upon him) said: "Wash it and pray in it." I said: O Messenger of Allah! Traces of the blood remain on it? He (peace and blessings be upon him) said: "There is no harm."
Abu Bakr said: Ibrahim al-Harbi said: Others are more reliable than al-Wazi' bin Nafi', and he did not hear from Khawlah bint Nimar (or Yasar) except in these two hadiths.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4118