Sefer HaMitzvot, Negative Commandments
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שהזהירנו משאול בעל אוב. והוא אמרו יתעלה לא ימצא בך וגו' ושואל אוב. והעובר על לאו זה כלומר שישאל באוב אינו חייב מיתה אבל הוא אסור. (שם, שם):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
That He prohibited us from inquiring of someone with an ov. And that is His, may He be exalted, saying, "Let no one be found among you ... or one who asks an ov" (Deuteronomy 18:10-11). And one who transgresses this negative commandment - meaning he inquires of an ov - is not liable for death, but it is forbidden. (See Parashat Shoftim; Mishneh Torah, Foreign Worship and Customs of the Nations 11.)