Leviticus 27:10 - Matthew Poole's English Annotations on the Holy Bible

He shall not alter it, nor change it; two words expressing the same thing more emphatically: q.d. He shall in no wise change it, neither for one of the same, nor of another kind. A good for a bad, or a bad for a good; partly because God would preserve the sanctity and reverence of consecrated things, and therefore would not have them alienated; and partly to prevent abuses of them who on this pretence might exchange it for the worse, as reserving the judgment to himself. The exchange thereof, i.e. both the thing first vowed, and thing offered or given in exchange. This was inflicted upon him as a just penalty for his rashness and levity in such weighty matters.