Ishaq bin Asyd Balfth إسحاق بن أسيد بالفتح الأنصاري · The Book of Purification and its Sunnah

He came to 'Umar bin Khattab from Egypt. 'Umar said: "How long has it been since you have taken off your leather socks?" He said: "From one Friday to the next." He said: "You have acted in accordance with the Sunnah."