"No one shall sanctify it"—Leviticus 27:26.
It is forbidden to switch the sacrificial designation of an animal; e.g., to take an animal designated as a Peace Offering and render it a Guilt Offering, or to take a Guilt Offering and switch it to a Sin Offering.
We are commanded regarding the ritual impurity contracted through contact with a human corpse. [I.e., if contracted, one must follow all the laws associated with this impurity.]