Leviticus 27:33-34 American Standard Version (ASV)

33. He shall not search whether it be good or bad, neither shall he change it: and if he change it at all, then both it and that for which it is changed shall be holy; it shall not be redeemed.

34. These are the commandments, which Jehovah commanded Moses for the children of Israel in mount Sinai.

Leviticus 27