The Torah commands in Parashat Kedoshim (Vayikra 19:31), “Al Tifnu El Ha’obot” – that it is forbidden to consult with the form of witchcraft called “Ob.” The Sefer Ha’hinuch explains that in ancient times, sorcerers would bring a certain type of incense and perform other rituals which would cause a voice to be heard from under the person’s arm. The sorcerers would “consult” with this voice to receive predictions about the future and other pieces of information. The Sefer Ha’hinuch writes that the Torah forbade practicing “Ob” because it could undermine one’s faith in G-d. We are to believe that everything which happens is brought about by G-d, and that He governs and orchestrates our lives in accordance with our deeds. Those who resort to witchcraft feel that they can “outsmart the system,” so-to-speak, that they can work around G-d and control their destiny independent of His governance by consulting with spirits. This undermines their faith in, and sense of subservience to, the Almighty. Moreover, the Sefer Ha’hinuch writes, these practices are generally associated with pagan beliefs and pagan worship, and thus the Torah forbade them as part of its firm rejection of idolatry, and to distance us from foreign worship. This prohibition applies in all times and places, and to both males and females. One who performed the “Ob” rituals in the presence of witnesses after having been warned is liable to Sekila (execution via stoning). If he committed this violation without witnesses or without a warning, then he is liable to Karet. If he violated this command unintentionally, then he must bring a Hatat (sin-offering). One who consults with an “Ob” sorcerer is liable to Malkut if he acts upon the guidance received from the sorcerer.