The 37th prohibition is that we are forbidden from requesting information or an answer to a question from one who performs the practice of yidoni.1

The source of this commandment is G‑d's statement,2 "Among you there shall not be found anyone...who consults ov or yidoni."

In the words of the Sifra, "[In the verse],3 'Do not turn to the idols called ov or yidoni,' ov refers to a pitom4 who speaks5 from his armpit, and yidoni is one who speaks6 from his mouth. They are punished by stoning, and the one who consults them transgresses a prohibition.7