Isaiah 20:2-4

at that time the LORD spoke through Isaiah son of Amoz. He said to him, ‘Take off the sackcloth from your body and the sandals from your feet.’ And he did so, going around stripped and barefoot. Then the LORD said, ‘Just as my servant Isaiah has gone stripped and barefoot for three years, as a sign and portent against Egypt and Cush, so the king of Assyria will lead away stripped and barefoot the Egyptian captives and Cushite exiles, young and old, with buttocks bared – to Egypt’s shame.