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].

وَعَنْ أَبِي هُرَيْرَةَ ‏- رضى الله عنه ‏- قَالَ: قَالَتْ خَوْلَةُ: { يَا رَسُولَ اَللَّهِ, فَإِنْ لَمْ يَذْهَبْ اَلدَّمُ? قَالَ:

يَكْفِيكِ اَلْمَاءُ, وَلَا يَضُرُّكِ أَثَرُهُ

} أَخْرَجَهُ اَلتِّرْمِذِيُّ, وَسَنَدُهُ ضَعِيف ٌ [1]‏ .‏