Musnad Abu Ya'la al-Mawsili 217:19

Abu Khaythama narrated to us, Abdullah ibn Idris narrated to us, al-A'mash narrated to us, from Salim ibn Abi al-Ja'd, from Kurayb, from Ibn Abbas, from Maymunah: That the Messenger of Allah (peace and blessings of Allah be upon him) performed ghusl (ritual bath). A towel was brought to him, but he did not touch it. He began to do this with the water with his fingers—meaning he was shaking his hand.