Then said the Lord unto Isaiah— Isaiah is ordered, with his son ישׁוב שׁאר Shear-jashub, whose name signifies the remnant shall return, (see chap. Isaiah 10:21.) to go and meet Ahaz at the end of the conduit of the upper pool, in the high-way of the fuller's field; a place of very public resort, where the messengers of the king of Assyria had delivered their threats, (see 2 Kings 18:17.) and whither it is thought Ahaz was then coming, in order to see whether he could not cut off from the enemy the waters of this pool. See 2 Chronicles 32:1-4 compared with 2 Chronicles 32:30. For, as the prophet's speech to the king was not only reprehensive but consolatory, it was proper that there should be many witnesses of it; and this appears to have been the case from Isaiah 7:9. The prophet took his son with him for the consolation of the pious; that his son, to whom this name was given by the divine command, as was the case also of another of his sons, (see chap. Isaiah 8:1; Isaiah 8:3; Isaiah 8:18.) might be shewn to them as a kind of sacrament to the divine promises, to assure them that in the greatest calamities of the nation God would never wholly forsake his people; but that a remnant should remain at all times, whom God would, after many years, restore from banishment; and that God would through Christ his son have mercy upon all them who would believe. See Vitringa.
Related Commentaries of Isaiah 7:3
Isaiah 7:3
3 Then said the LORD unto Isaiah, Go forth now to meet Ahaz, thou, and Shearjashubb thy son, at the end of the conduit of the upper pool in the highway of the fuller's field;