Isaiah 7:3

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 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.