'Substitution' in the Bible

He may not replace it or make a substitution for it, either good for bad, or bad for good. But if he does substitute one animal for another, both that animal and its substitute will be holy.

He is not to inspect whether it is good or bad, and he is not to make a substitution for it. But if he does make a substitution, both the animal and its substitute will be holy; they cannot be redeemed.”