Leviticus 17:3-4

3If a person sacrifices a bull, a sheep or a goat in the fields, that is a sin. Or if a person sacrifices it in the camp, that is a sin.

4The animal is an offering to the Lord. The person should bring it to the door of the tabernacle. He should offer it to the Lord there. The person who offers a sacrifice anywhere else has sinned. He has sacrificed an animal in the wrong way. He must leave the camp.