He must not inspect whether it is good or bad, and he shall not make any substitution. But if he does make a substitution, both the animal and its substitute shall become holy; they cannot be redeemed.’”
Jewish Publication Society of America Version (JPS1917) - Leviticus 27:33 >He shall not inquire 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.