They replied, “If you return the ark of the God of Israel, do not send it away empty, but by all means return it to Him with a guilt offering. Then you will be healed, and you will understand why His hand has not been lifted from you.”
The first words of the chapter tell us how long the captivity of the ark continued - it was in the country of the Philistines seven months. In the field of the Philistines (so it is in the original), from which some gather that, having tried it in all their cities, and found it a plague to the inhabitants of each, at length they sent...
Commenting on 1 Samuel 6:1-9
And they said, if ye send away the ark of the God of Israel, send it not empty,.... As they perceived they had either resolved upon, or at least were inclined to do; and which they also thought advisable and therefore would have them by no means send it away as it was, but with some presents along with it; for the meaning of this...
And they said, If ye send away the ark of the God of Israel, send it not empty; but in any wise return him a trespass offering: then ye shall be healed, and it shall be known to you why his hand is not removed from you. (b) The idolaters confess there is a true God, who punishes sin justly.