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. Tell the Philistine messengers? Tell them, “The LORD has built Jerusalem; its walls will give refuge to his oppressed people.”
It reads in Isaiah 14:28-32 NIV>
“A Prophecy Against the Philistines”
This prophecy came in the year King Ahaz died: Do not rejoice, all you Philistines, that the rod that struck you is broken; from the root of that snake will spring up a viper, its fruit will be a darting, venomous serpent. The poorest of the poor will find pasture, and the needy will lie down in safety. But your root I will destroy by famine; it will slay your survivors. Wail, you gate! Howl, you city! Melt away, all you Philistines! A cloud of smoke comes from the north, and there is not a straggler in its ranks. What answer shall be given to the envoys of that nation? “The Lord has established Zion, and in her, his afflicted people will find refuge.”

