سنن النسائي

It was narrated that Ibn 'Abbas said: "My maternal aunt Maimunah told me: 'I brought the Messenger of Allah (ﷺ) water for his Ghusl from Janabah, and he washed his hands two or three times, then he put his right hand in the vessel and poured water over his private part, then he washed it with his left hand. Then he put his left hand on the ground and rubbed it hard. Then he performed Wudu' as for prayer,then poured three scoops with his two hands full of water over his head, then he washed his entire body, then he moved away from where he had been standing and washed his feet.' She said: 'Then I brought him a towel but he refused it.'"