Vayikra 20:26-27

Orthodox Jewish Bible

²⁶ And ye shall be kadoshim unto Me: for I Hashem am kadosh, and have separated you from the nations, that ye should be Mine.

²⁷ An ish also or isha who is an Ov (Medium) or a Yidoni (Spiritist), shall surely be put to death; they shall stone them with stones; their dahm shall be upon them.