2the LORD had already spoken through Isaiah son of Amoz, saying, “Go, remove the sackcloth from your waist and the sandals from your feet.” And Isaiah did so, walking around naked and barefoot.
3Then the LORD said, “Just as My servant Isaiah has gone naked and barefoot for three years as a sign and omen against Egypt and Cush,
4so the king of Assyria will lead away the captives of Egypt and the exiles of Cush, young and old alike, naked and barefoot, with bared buttocks — to Egypt’s shame.
5Those who made Cush their hope and Egypt their boast will be dismayed and ashamed.
— Isaiah 20:2-5