A woman asked the Messenger of Allah (ﷺ) how to wash herself after menstruation. She mentioned that he taught her how to take bath and then told her to take a piece of cotton with musk and purify herself. She said: How should I purify myself with that? He (the Holy Prophet) said: Praise be to Allah, purify yourself with it, and covered his face, Sufyan b. 'Uyaina gave a demonstration by covering his face (as the Prophet had done). 'A'isha reported: I dragged her to my side for I had understood what the Messenger of Allah (ﷺ) intended and, therefore, said: Apply this cotton with musk to the trace of blood. Ibn 'Umar in his hadith (has mentioned the words of 'A'isha thus): Apply it to the marks of blood.