Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrated that the Messenger of Allah (peace and blessings be upon him) wiped over the leather socks; then (Sayyiduna Ibn Abbas, may Allah be pleased with them both) said: "Ask those who claim that the Messenger of Allah (peace and blessings be upon him) wiped over the leather socks after Surah al-Ma'idah. By Allah, he (peace and blessings be upon him) did not wipe after al-Ma'idah; and wiping over the back of a mule or donkey is dearer to me than wiping over these two socks."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12235