Leviticus 27:33

You must not look to see if it is good or bad or exchange it. If you do exchange it, both the first animal and its substitute will be holy. They may not be bought back.'

Leviticus 27:10

Do not exchange or substitute animals, a good one for a bad one or a bad one for a good one. If you do exchange one animal for another, then both animals will be holy.

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