To comfort the Jews, lest they should fear that people; not in order to call the Philistines to repentance, since the prophecy was probably never circulated among them. They had been subdued by Uzziah or Azariah (2Ch 26:6); but in the reign of Ahaz (2Ch 28:18), they took several towns in south Judea. Now Isaiah denounces their final subjugation by Hezekiah.
In ... year ... Ahaz died - 726 b.c. Probably it was in this year that the Philistines threw off the yoke put on them by Uzziah.