Isaiah 20:2-4

at the same time the LORD spoke by Isaiah the son of Amoz, saying, “Go, and remove the sackcloth from your body, and take your sandals off your feet.” And he did so, walking naked and barefoot. Then the LORD said, “Just as My servant Isaiah has walked naked and barefoot three years for a sign and a wonder against Egypt and Ethiopia, so shall the king of Assyria lead away the Egyptians as prisoners and the Ethiopians as captives, young and old, naked and barefoot, with their buttocks uncovered, to the shame of Egypt.