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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”. .
Source: sunnah.com
Other translations
Arabic
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 .
sunnah.com