7 Bible Verses about Penalties For Serving Other Gods

or a curse if you don't obey the commands of the LORD your God, by turning from the way that I'm commanding you today and following other gods whom you have not known."

"You may discover that a man or woman living in one of your cities that the LORD your God is about to give you has done evil in the eyes of the LORD your God by transgressing his covenant. He may be following and serving other gods by bowing down to them that is, to the sun, the moon, or to any of the heavenly host (something I did not command). When it is reported to you or you hear of it, then investigate it thoroughly. When the truth has been established that this detestable thing has been done in Israel, read more.
summon the man or the woman who did this evil thing to your city gates. Then stone the man or the woman to death. Based on the testimony of two or three witnesses, they must surely die. But they are not to die based on the testimony of one person. Let the witnesses be the first to begin executing them, then the rest of the people shall follow. By doing this you will purge evil from among you."

"Anyone who sacrifices to a god, except the LORD alone, is to be utterly destroyed.

But if you turn your heart away, and do not obey, but instead if you stray away to worship and serve other gods,

and if you don't oppress the alien, the orphan, and the widow, and don't shed an innocent person's blood in this place, and if you don't follow other gods to your own harm,

They are not to live in your land. Otherwise they will cause you to sin against me. If you worship their gods, it will become a snare for you."

Even then, if the prophet speaks presumptuously in my name, which I didn't authorize him to speak, or if he speaks in the name of other gods, that prophet must die.'