'Guilt offering' in the Bible

They said, “If you send away the ark of the God of Israel, do not send it empty [without a gift]; but be sure to return [it] to Him [together with] a guilt offering. Then you will be healed, and it will be known to you why His hand is not removed from you.”

Then they said, “What shall the guilt offering be which we shall return to Him?” They answered, “Five golden tumors and five golden mice, according to the number of the lords (governors) of the Philistines, for one plague was on all of you and on your lords.

Then take the ark of the Lord and put it on the cart; and put the articles of gold which you are returning to Him as a guilt offering in a box beside it. Then send it away [without a driver].

These are the golden tumors which the Philistines returned as a guilt offering to the Lord: one for Ashdod, one for Gaza, one for Ashkelon, one for Gath and one for Ekron [the five chief cities of the Philistines];