John Gill Commentary 1 Samuel 6:17

"And these are the golden tumors which the Philistines returned for a trespass-offering unto Jehovah: for Ashdod one, for Gaza one, for Ashkelon one, for Gath one, for Ekron one;" — 1 Samuel 6:17 (ASV)

And these are the golden emerods, which the Philistines returned for a trespass offering unto the Lord Along with the ark:

for Ashdod one, for Gaza one, for Ashkelon, one, for Gath one, for Ekron one ; which were the five principalities of the Philistines that belonged to the five lords before mentioned; and each of these were at the expense of a golden emerod, and sent it along with the ark to make atonement for the offence they had been guilty of in taking and detaining it.