Commentaries
14:28-32 Assurance is given of the destruction of the Philistines and their power, by famine and war. Hezekiah would be more terrible to them than Uzziah had been. Instead of rejoicing, there would be lamentation, for the whole land would be ruined. Such destruction will come upon the proud and rebellious, but the Lord founded Zion for a refuge to poor sinners, who flee from the wrath to come, and trust in his mercy through Christ Jesus. Let us tell all around of our comforts and security, and exhort them to seek the same refuge and salvation.
30. first-born of … poor—Hebraism, for the most abject poor; the first-born being the foremost of the family. Compare "first-born of death" (Job 18:13), for the most fatal death. The Jews, heretofore exposed to Philistine invasions and alarms, shall be in safety. Compare Ps 72:4, "Children of the needy," expressing those "needy in condition."
feed—image from a flock feeding in safety.
root—radical destruction.
He shall slay—Jehovah shall. The change of person, "He" after "I," is a common Hebraism.