Leviticus 27:33

One shall not differentiate between good or bad , neither shall he make a substitute for it; and if he does substitute for it, then both it and the substitute shall be holy ; it shall not be redeemed .

No one may pick out the good from the bad or make any substitution. If anyone does make a substitution, both the animal and its substitute become holy and cannot be redeemed.`”

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 the change thereof shall be holy; it shall not be redeemed.