7 Bible Verses about Penalties For Serving Other Gods

and the curse, if you do not listen to and obey the commandments of the Lord your God, but turn aside from the way which I am commanding you today, by following (acknowledging, worshiping) other gods which you have not known.

“If there is discovered among you, within any of your cities, which the Lord your God is giving you, a man or a woman who does evil in the sight of the Lord your God, by transgressing (violating) His covenant, and has gone and served other gods and worshiped them, or the sun or the moon or any of the heavenly host, [doing these things] which I have commanded not to do, and if it is told to you and you hear about it, then you shall investigate thoroughly [all the charges]. If it is confirmed beyond doubt that this detestable thing has been done in Israel, read more.
then you shall bring that man or that woman who has done this evil thing to the gates [of your city] and you shall stone the man or the woman to death. On the evidence of two or three witnesses, he who is to die shall be put to death; he shall not be put to death on the evidence of [only] one witness. The hand of the witnesses shall be the first against him to put him to death, and afterward the hand of all the people. So you shall remove the evil from among you.

“He who sacrifices to any god, other than to the Lord alone, shall be put under a ban (designated) for destruction (execution).

But if your heart turns away and you will not hear and obey, but are drawn away and worship other gods and serve them,

if you do not oppress the transient and the foreigner, the orphan, or the widow, and do not shed innocent blood [by oppression and by unjust judicial murders] in Jerusalem, nor follow after other gods to your own ruin,

They shall not live in your land, because they will make you sin against Me; for if you serve their gods, it is certain to be a trap for you [resulting in judgment].”

But the prophet who presumes to speak a word in My name which I have not commanded him to speak, or which he speaks in the name of other gods—that prophet shall die.’