Sayyiduna al-Mughirah bin Shu'bah (may Allah be pleased with him) said: During the Battle of Tabuk I placed water for the Prophet (peace and blessings be upon him) (for ablution), and he (peace and blessings be upon him) wiped over the top and bottom of the khuff (leather sock).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1378