III. The exposition of this sign, v. 3, 4. It was intended to signify that the Egyptians and the Ethiopians should be led away captive by the king of Assyria, thus stripped, or in rags, and very shabby clothing, as Isaiah was. God calls him his servant Isaiah, because in this matter particularly he had approved himself God's willing, faithful, obedient servant; and for this very thing, which perhaps others laughed at him for, God gloried in him. To obey is better than sacrifice; it pleases God and praises him more, and shall be more praised by him. Isaiah is said to have walked naked and barefoot three years, whenever in that time he appeared as a prophet. But some refer the three years, not to the sign, but to the thing signified: He has walked naked and barefoot; there is a stop in the original; provided he did so once that was enough to give occasion to all about him to enquire what was the meaning of his doing so; or, as some think, he did it three days, a day for a year; and this for a three years' sign and wonder, for a sign of that which should be done three years afterwards or which should be three years in the doing. Three campaigns successively shall the Assyrian army make, in spoiling the Egyptians and Ethiopians, and carrying them away captive in this barbarous manner, not only the soldiers taken in the field of battle, but the inhabitants, young and old; and it being a very piteous sight, and such as must needs move compassion in those that had the least degree of tenderness left them to see those who had gone all their days well dressed now stripped, and scarcely having rags to cover their nakedness, that circumstance of their captivity is particularly taken notice of, and foretold, the more to affect those to whom this prophecy was delivered. It is particularly said to be to the shame of Egypt (v. 4), because the Egyptians were a proud people, and therefore when they did fall into disgrace it was the more shameful to them; and the higher they had lifted up themselves the lower was their fall, both in their own eyes and in the eyes of others.