They said, "If you send away the ark of the God of Israel, don't send it empty; but by all means return him a trespass-offering: then you shall be healed, and it shall be known to you why his hand is not removed from you."
and it shall be known to you why his hand is not removed from you; which was because the ark was detained by them; but when that should be sent home, and they be healed upon it, then it would be a plain case that the reason why the disease was inflicted and continued was because of that.