(Devarim 12:15) "Only with all the desire of your soul shall you slaughter": Of what is Scripture speaking here? If of "lust-flesh" (i.e., slaughtering a non-consecrated animal for food), this is spoken of elsewhere (20); and if of the eating of consecrated flesh, this has already been spoken of (as being permitted only in Jerusalem, whereas here it is written "in all of your gates"). It must be speaking, then, of consecrated animals (which had sustained a blemish) and were redeemed (and were to be eaten in "all of your gates").
Slaughtering with Desire and the Rules of Lust-Flesh
Sifrei Devarim 71:1