The oracle against Philistia is dated by the year in which Ahaz died. The historical background is far from certain. It may be that Philistia made an effort to lead Judah, Edom, and Moab in an insurrection against Assyria (ca. 715 BC) that was put down by Sargon II in 711 BC. The Philistines have hoped for the end of Assyria’s dominance, but Isaiah warns them that they will be put down several times (711, 701, 586 …
Baker Publishing Group, The Baker Illustrated Bible Commentary, by Gary M. Burge