Leviticus 27:10

He must not replace it or trade it. He must not trade a good one for a bad one or a bad one for a good one. If he does trade one animal for another, then both animals will be holy.

Leviticus 27:10, Readable English Bible (READ)

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Previous · Leviticus 27:9He may promise an animal that can be brought as an offering to the LORD. Then any animal like that given to the LORD will be holy. Next · Leviticus 27:11But he may promise an unclean animal, one that cannot be brought as an offering to the LORD. Then the animal must be brought to the priest.