Philistia in the Bible

Thus says the Lord,
“For three transgressions of Gaza [in Philistia] and for four (multiplied delinquencies)
I will not reverse its punishment or revoke My word concerning it,
Because [as slave traders] they took captive the entire [Jewish] population [of defenseless Judean border villages, of which none was spared]
And deported them to Edom [for the slave trade].

Proclaim on the fortresses in Ashdod (Philistia) and on the citadels in the land of Egypt, and say, “Assemble yourselves on the mountains of Samaria, and see the great confusion within her and the oppressions and abuse of authority in her midst.