(10) باب الْقَدْرِ الْمُسْتَحَبِّ مِنَ الْمَاءِ فِي غُسْلِ الْجَنَابَةِ وَغُسْلِ الرَّجُلِ وَالْمَرْأَةِ فِي إِنَاءٍ وَاحِدٍ فِي حَالَةٍ وَاحِدَةٍ وَغُسْلِ أَحَدِهِمَا بِفَضْلِ الآخَرِ
Abu Salamab. 'Abd al-Rahman reported:
I along with the foster brother of 'A'isha went to her and he asked about the bath of the Apostle (ﷺ) because of sexual intercourse. She called for a vessel equal to a Sa' and she took a bath. and there was a curtain between us and her. She poured water on her head thrice and he (Abu Salama) said: The wives of the Apostle (ﷺ) collectedhair on their heads and these lopped up to ears (and did rot go beyond that).
Reference: Sahih Muslim 320
In-book reference: Book 3, Hadith 50
USC-MSA web (English) reference(deprecated numbering scheme): Book 3, Hadith 626