Leviticus 17:3

3-4If any Israelite wants to kill a bull, a lamb or a goat as a sacrifice, he must bring it to the entrance of the Tent of Meeting. He must bring it there as an offering to the Lord. If he kills the animal anywhere else in the camp or outside the camp, he is guilty of a sin. He has poured out the animal's blood in a wrong way. He can no longer belong among Israel's people.