Deuteronomy 17:3-5

3and contrary to my command has worshiped other gods, bowing down to them or to the sun or the moon or the stars in the sky,

4and 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,

5take the man or woman who has done this evil deed to your city gate and stone that person to death.