Bulugh al-Maram

Bulugh al-Maram 124

Taking Ghusl (bath) And the precepts regarding Sexual Impurity
Arabic hadith text
وَعَنْ أَبِي هُرَيْرَةَ ‏- رضى الله عنه ‏- قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ إِنَّ تَحْتَ كُلِّ شَعْرَةٍ جَنَابَةً, فَاغْسِلُوا اَلشَّعْرَ, وَأَنْقُوا اَلْبَشَرَ } رَوَاهُ أَبُو دَاوُدَ, وَاَلتِّرْمِذِيُّ وَضَعَّفَاه ُ 1‏ .‏‏1 ‏- منكر.‏ رواه أبو داود (248)‏، والترمذي (106)‏.‏
Translation
Narrated Abu Hurairah (RAA)

Allah's Messenger (Peace be upon him) said: "There is Janabah (trace of sexual impurity) under every hair, so wash your hair and cleanse the skin."Abu Dawud and at-Tirmidhi transmitted it but they declared it to be weak.