Isaiah 20:2-3

2at that time the LORD spoke through Isaiah son of Amoz. He said to him, “Take off the sackcloth from your body and the sandals from your feet.” And he did so, going around stripped and barefoot. 3Then the LORD said, “Just as my servant Isaiah has gone stripped and barefoot for three years, as a sign and portent against Egypt and Cush, That is, the upper Nile region; also in verse 5