(3) باب إزالة النجاسة وبيانها
Narrated Abu Huraira (rad):
Khaula said, "O Messenger of Allah, suppose the (trace of) the blood does not go?" He said, "(Washing it with) water will suffice you and its trace won't harm you". [Reported by At Tirmidhi, and its Sanad (chain of narrators) is weak].
Reference: Bulugh al-Maram 31
In-book reference: Book 1, Hadith 36
English translation: Book 1, Hadith 35