Sayyiduna Ibn Abbas (may Allah be pleased with them both) used to recite: "And wipe over your heads and (wash) your feet (wa arjulakum)" [Surah al-Ma'idah: 6], and he would say: The ruling on the feet has returned to washing.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 329