I gathered my hair into a tight braid, and the Messenger of Allah ﷺ said to me, "Ayesha, do you not know that ritual impurity reaches every strand of hair?"
حدثنا يحيى بن آدم قال حدثنا شريك عن خصيف قال حدثني رجل منذ ثلاثين سنة
أجمرت شعري إجمارا شديدا فقال لي رسول الله ﷺ يا عائشة أما علمت أن على كل شعرة جنابة
Its chain of transmission is daif due to the unknown identity of the narrator from Ayesha, but the hadith is sahih, having previously appeared at 24678.