Sunan Abi Dawud

Aishah said:Asma' asked the Prophet (ﷺ) and then narrated the rest of the tradition to the same effect. He (the Prophet) said: ""a musk-scented piece of cloth."" She (Asma') said: How should I purify with it ? He said: By glory of Allah ! Purify with it, and he covered his face with the cloth. This version also adds: ""She asked about the washing because of sexual defilement."" He said: Take your water and purify yourself as best as possible. Then pour water over yourself. 'Aishah said: The best of the women are the women of the Ansar. Shyness would not prevent them from inquiring about religion and from acquiring deep understanding in it