Amos 1:6-8

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. So I will send a fire upon the wall of Gaza, and it shall devour her strongholds. I will cut off the inhabitants from Ashdod, and him who holds the scepter from Ashkelon; I will turn my hand against Ekron, and the remnant of the Philistines shall perish,” says the Lord GOD.