Isaiah 20:2-3

2At that time, the Lord gave this message to Isaiah, the son of Amoz. He said, ‘Go and remove the rough clothes that you are wearing. Take your shoes off your feet.’ Isaiah did what the Lord told him to do. He walked about without clothes and without shoes.

3After three years, the Lord said, ‘My servant Isaiah has walked without clothes and without shoes for three years. That is a sign to warn Egypt and Cush about what will happen to them.