Isaiah 20:2-3
2
at that time Yahweh spoke by Isaiah the son of Amoz, saying, "Go, and loosen the sackcloth from off your waist, and take your shoes from off your feet." He did so, walking naked and barefoot.
3
Yahweh said, "As my servant Isaiah has walked naked and barefoot three years for a sign and a wonder concerning Egypt and concerning Ethiopia,