Musnad Abu Ya'la al-Mawsili 150:354

Hadaba ibn Khalid narrated to us, Hammam narrated to us, Qatada narrated to us, from Safiyya bint Shayba, from Aisha, who said: The Messenger of Allah (ﷺ) used to perform ghusl with the amount of a sa’ and perform wudu with the amount of a mudd.