Three years for a sign.— A three years' sign. The meaning seems to be, not that Isaiah walked three years naked and barefooted, but that he walked naked and barefoot for a sign of what should happen three years afterwards.
Related Commentaries of Isaiah 20:3
Isaiah 20:3
3 And the LORD said, Like as my servant Isaiah hath walked naked and barefoot three years for a sign and wonder upon Egypt and upon Ethiopia;