Isaiah 20:2-4

2At the same time spoke the LORD by Isaiah the son of Amoz, saying, Go and loose the sackcloth from off thy loins, and put off thy shoe from thy foot. And he did so, walking naked and barefoot.1

3And the LORD said, As my servant Isaiah hath walked naked and barefoot three years for a sign and wonder upon Egypt and upon Cush;

4So shall the king of Assyria lead away the Egyptians prisoners, and the Cushites captives, young and old, naked and barefoot, even with their hind parts uncovered, to the shame of Egypt.23