Musnad Ahmad 33:138

Hushaym narrated to us, Yazid ibn Abi Ziyad informed us, from Salim ibn Abi al-Ja'd, from Jabir ibn Abdullah, who said: "The Messenger of Allah, peace and blessings of Allah be upon him, used to perform ghusl (full ablution) with a sa' (a measure), and he used to perform wudu (ablution) with a mudd (a measure)."