Deuteronomy 17:3-5

New International Version - UK

³ and contrary to my command has worshipped other gods, bowing down to them or to the sun or the moon or the stars in the sky, ⁴ and this has been brought to your attention, then you must investigate it thoroughly. If it is true and it has been proved that this detestable thing has been done in Israel, ⁵ take the man or woman who has done this evil deed to your city gate and stone that person to death.