Amos 1:6-8 RSV

6 Thus says the LORD: "For three transgressions of Gaza, and for four, I will not revoke the punishment; because they carried into exile a whole people to deliver them up to Edom.
7 So I will send a fire upon the wall of Gaza, and it shall devour her strongholds.
8 I will cut off the inhabitants from Ashdod, and him that holds the scepter from Ash'kelon; I will turn my hand against Ekron; and the remnant of the Philistines shall perish," says the Lord GOD.