Anas (may Allah be pleased with him) narrates that I saw the Messenger of Allah (peace and blessings be upon him) when the time for Asr prayer had come, and the people searched for water. When they did not find any water, water for ablution was brought to the Messenger of Allah (peace and blessings be upon him) in a vessel. The Messenger of Allah (peace and blessings be upon him) put his hand in it and instructed the people to perform ablution from that (vessel). Anas (may Allah be pleased with him) says: I saw water gushing forth from beneath his (peace and blessings be upon him) fingers, and the people performed ablution until even the last person (in the caravan) had performed ablution.
Hadith Referenceمسند الإمام الشافعي / كتاب الطهارة / 16
Hadith Takhrijأخرجه البخاري: الوضوء، باب التماس الوضوء إذا حانت الصلاة: (169)، (3573) ومسلم: الفضائل، باب في معجزات نبی ﷺ: (2279).