عَنْ زَيْدِ بْنِ ثَابِتٍ أَنَّهُ رَأَى النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ تَجَرَّدَ لِإِهْلَالِهِ وَاغْتَسَلَ. رَوَاهُ التِّرْمِذِيّ والدارمي

Ibn ‘Umar said that the Prophet matted his hair with ghisl (A lotion made of marsh-mallows, or lotus leaves, or fuller’s earth, or potash with water). Abu Dawud transmitted it.