Isa 20:2-4

2at that time the Lord had spoken to Isaiah son of Amoz, saying, “Go, and loose the sackcloth from your loins and take your sandals off your feet,” and he had done so, walking naked and barefoot.3Then the Lord said, “Just as my servant Isaiah has walked naked and barefoot for three years as a sign and a portent against Egypt and Ethiopia,4so shall the king of Assyria lead away the Egyptians as captives and the Ethiopians as exiles, both the young and the old, naked and barefoot, with buttocks uncovered, to the shame of Egypt.