"Do not turn to Yid'oni"Leviticus 19:31.

We are forbidden from employing the idolatrous practice of Yid'oni.

The Yid'oni practice consisted of inserting into one's mouth a bone from the yidoa fowl. After then burning incense, saying certain formulas and doing certain rites, the person would enter a trance-like state, and he would begin issuing predictions about the future.