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.”
Jewish Publication Society of America Version (JPS1917) - 1 Samuel 6:3 >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 guilt-offering; then ye shall be healed, and it shall be known to you why His hand is not removed from you.'