Isaiah 20:2-4

MLV(i) 2 at that time Jehovah spoke by Isaiah the son of Amoz, saying, Go and loose the sackcloth from your loins and put your shoe from your foot. And he did so, walking naked and barefoot.
3 And Jehovah said, Just as my servant Isaiah has walked naked and barefoot three years for a sign and a wonder concerning Egypt and concerning Ethiopia, 4 so will the king of Assyria lead away the captives of Egypt and the exiles of Ethiopia, young and old, naked and barefoot and with buttocks uncovered, to the shame of Egypt.