Exodus 22:20

He who sacrifices to any god, other than to the Lord alone, shall be utterly destroyed.

Deuteronomy 17:2-5

If there is found in your midst, in any of your towns, which the Lord your God is giving you, a man or a woman who does what is evil in the sight of the Lord your God, by transgressing His covenant,

Numbers 25:7-8

When Phinehas the son of Eleazar, the son of Aaron the priest, saw it, he arose from the midst of the congregation and took a spear in his hand,

Deuteronomy 13:1-15

If a prophet or a dreamer of dreams arises among you and gives you a sign or a wonder,

Deuteronomy 18:20

But the prophet who speaks a word presumptuously 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.’

Numbers 21:3

The Lord heard the voice of Israel and delivered up the Canaanites; then they utterly destroyed them and their cities. Thus the name of the place was called Hormah.

Numbers 25:2-4

For they invited the people to the sacrifices of their gods, and the people ate and bowed down to their gods.

Joshua 23:15-16

It shall come about that just as all the good words which the Lord your God spoke to you have come upon you, so the Lord will bring upon you all the threats, until He has destroyed you from off this good land which the Lord your God has given you.

Treasury of Scripture Knowledge

Summary

He that sacrificeth unto any god, save unto the LORD only, he shall be utterly destroyed.

Bible References

Sacrificeth

Numbers 25:2
For they invited the people to the sacrifices of their gods, and the people ate and bowed down to their gods.
Deuteronomy 13:1
If a prophet or a dreamer of dreams arises among you and gives you a sign or a wonder,
Deuteronomy 17:2
If there is found in your midst, in any of your towns, which the Lord your God is giving you, a man or a woman who does what is evil in the sight of the Lord your God, by transgressing His covenant,
Deuteronomy 18:20
But the prophet who speaks a word presumptuously 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.’

Utterly

Numbers 21:3
The Lord heard the voice of Israel and delivered up the Canaanites; then they utterly destroyed them and their cities. Thus the name of the place was called Hormah.
Joshua 23:15
It shall come about that just as all the good words which the Lord your God spoke to you have come upon you, so the Lord will bring upon you all the threats, until He has destroyed you from off this good land which the Lord your God has given you.