Musannaf Ibn Abi Shayba 1:713

713. Abd al-Rahim ibn Sulayman narrated to us, from al-Hajjaj, from Abu Ja'far, who said: The Messenger of Allah (may Allah bless him and grant him peace) used to perform ablution (wudu) with a mudd of water, and perform the ritual bath (ghusl) with a sa'.