Isaiah 7:3

God instructed Isaiah to take his son Shearjashub ("a remnant shall return;" cf. Isaiah 6:13) and meet Ahaz at a strategic water source for Jerusalem, which Ahaz was apparently examining. The location of this pool is uncertain, but it was a reservoir for Jerusalem (cf. Isaiah 36:2), perhaps near the Gihon Spring in the Kidron Valley. [Note: Watts, p. 91.] A vulnerable above-ground aqueduct brought water from it into the city. The fuller’s field was a place where people washed clothes, fuller being another name for launderer.

Shearjashub’s presence may have been designed to encourage Ahaz to believe that his enemy would not destroy Judah completely, even though they had already defeated him previously (cf. Isaiah 7:4). Still, the mention of only a remnant returning was sobering. This was the very spot on which Sennacherib’s field commander later stood to hurl insults at Hezekiah (Isaiah 36:2), the fulfillment of Isaiah’s prediction of an Assyrian attack.