"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."
NIV
The man shall not examine whether the animal is good or bad nor shall he exchange it. If he does exchange it, then both it and the animal substituted for it shall be holy; it shall not be redeemed.
AMP
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.
KJV
