Reference

Isaiah 20:4

So shall the king of Assyria lead away the Egyptians prisoners, and the Ethiopians captives, young and old, naked and barefoot, even with their buttocks uncovered, to the shame of Egypt.
2

At the same time spake the Lord by Isaiah the son of Amoz, saying, Go and loose the sackcloth from off thy loins, and put off thy shoe from thy foot. And he did so, walking naked and barefoot.

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;

4

So shall the king of Assyria lead away the Egyptians prisoners, and the Ethiopians captives, young and old, naked and barefoot, even with their buttocks uncovered, to the shame of Egypt.

5

And they shall be afraid and ashamed of Ethiopia their expectation, and of Egypt their glory.

6

And the inhabitant of this isle shall say in that day, Behold, such is our expectation, whither we flee for help to be delivered from the king of Assyria: and how shall we escape?

Counter-Arguments

The strongest case that this verse does not belong in this theme.

Prophetic Sign Acts

This verse describes a future event involving the king of Assyria and the Egyptians/Ethiopians, not an action performed by a prophet. There is no mention of a prophet performing a symbolic act.