Sunan Abi Dawud 255
سنن أبي داود#255Sahihحَدَّثَنَا مُحَمَّدُ بْنُ عَوْفٍ، قَالَ قَرَأْتُ فِي أَصْلِ إِسْمَاعِيلَ بْنِ عَيَّاشٍ - قَالَ ابْنُ عَوْفٍ - وَحَدَّثَنَا مُحَمَّدُ بْنُ إِسْمَاعِيلَ، عَنْ أَبِيهِ، حَدَّثَنِي ضَمْضَمُ بْنُ زُرْعَةَ، عَنْ شُرَيْحِ بْنِ عُبَيْدٍ، قَالَ أَفْتَانِي جُبَيْرُ بْنُ نُفَيْرٍ عَنِ الْغُسْلِ، مِنَ الْجَنَابَةِ أَنَّ ثَوْبَانَ، حَدَّثَهُمْ أَنَّهُمُ، اسْتَفْتَوُا النَّبِيَّ صلى الله عليه وسلم عَنْ ذَلِكَ فَقَالَ " أَمَّا الرَّجُلُ فَلْيَنْشُرْ رَأْسَهُ فَلْيَغْسِلْهُ حَتَّى يَبْلُغَ أُصُولَ الشَّعْرِ وَأَمَّا الْمَرْأَةُ فَلاَ عَلَيْهَا أَنْ لاَ تَنْقُضَهُ لِتَغْرِفْ عَلَى رَأْسِهَا ثَلاَثَ غَرَفَاتٍ بِكَفَّيْهَا " .
Narrated Thawban: Shurayh ibn Ubayd said: Jubayr ibn Nufayr gave me a verdict about the bath because of sexual defilement that Thawban reported to them that they asked the Prophet (ﷺ) about it. He (the Prophet) replied: As regards man, he should undo the hair of his head and wash it until the water should reach the roots of the hair. But there is no harm if the woman does not undo it (her hair) and pour three handfuls of water over her head
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 1:255