Leviticus 20:22-27 - You Shall Be Holy
22 If you carefully obey all my laws and my rules, the land I am bringing you to live in will not vomit you out. 23 The nations I am chasing out did these disgusting things. I hated them for it! So do not follow their example. 24 I am Jehovah your God. I have promised you their land that is rich with milk and honey. I have chosen you to be different from other people. 25 That is why you must make a difference between animals and birds that I have said are clean and unclean. This will keep you from becoming disgusting to me. 26 I am Jehovah, the Holy God. You have been chosen to be my people, and so you must be holy too.
27 If you claim to receive messages from the dead, you will be put to death by stoning, just as you deserve.