It is narrated from Sayyiduna Abdullah bin Zayd (may Allah be pleased with him) that two thirds of a mudd of water was brought to the Prophet (peace and blessings be upon him); he (peace and blessings be upon him) performed ablution and was rubbing his forearms.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 942