The Prophet ﷺ said, "A mudd of water is enough for any of you to perform ablution."
حدثنا معاوية بن عمرو حدثنا زائدة عن سفيان عن عبد الله بن عيسى قال حدثني جبر بن عبد الله
عن النبي ﷺ أنه قال يكفي أحدكم مد في الوضوء
No references are available.
Its isnad is sahih. It was mentioned earlier that the Messenger of Allah ﷺ used to perform wudu with a mudd. As for this wording, it was reported by Abu Awana, 1/223.