Isaiah 20:2-4

at that time the LORD spoke through Isaiah the son of Amoz, saying, “Go and loosen the sackcloth from your hips and take your shoes off your feet.” And he did so, going naked and barefoot. And the LORD said, “Even as My servant Isaiah has gone naked and barefoot three years as a sign and token against Egypt and Cush, so the king of Assyria will lead away the captives of Egypt and the exiles of Cush, young and old, naked and barefoot with buttocks uncovered, to the shame of Egypt.