Leviticus 22:8

22:8 He must not eat an animal that has died of natural causes or an animal torn by beasts and thus become unclean by it. I am the Lord.

Leviticus 15:32

15:32 This is the law of the one with a discharge: the one who has a seminal emission and becomes unclean by it,

Leviticus 18:20

18:20 You must not have sexual intercourse with the wife of your fellow citizen to become unclean with her.

Leviticus 18:23

18:23 You must not have sexual intercourse with any animal to become defiled with it, and a woman must not stand before an animal to have sexual intercourse with it; it is a perversion.

Leviticus 19:31

19:31 Do not turn to the spirits of the dead and do not seek familiar spirits to become unclean by them. I am the Lord your God.