Isaiah 20:2-3

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,