Exodus 22:20

Complete destruction will come on any man who makes offerings to any other god but the Lord.

Deuteronomy 17:2-5

If there is any man or woman among you, in any of the towns which the Lord your God gives you, who does evil in the eyes of the Lord your God, sinning against his agreement,

Numbers 25:7-8

And Phinehas, the son of Eleazar, the son of Aaron the priest, seeing it, got up from among the people and took a spear in his hand,

Deuteronomy 13:1-15

If ever you have among you a prophet or a dreamer of dreams and he gives you a sign or a wonder,

Deuteronomy 18:20

But the prophet who takes it on himself to say words in my name which I have not given him orders to say, or who says anything in the name of other gods, will come to his death.

Numbers 21:3

And the Lord, in answer to the voice of Israel, gave the Canaanites up to them; and they put them and their towns completely to destruction: and that place was named Hormah.

Numbers 25:2-4

For they sent for the people to be present at the offerings made to their gods; and the people took part in their feasts and gave honour to their gods.

Joshua 23:15-16

And you will see that, as all the good things which the Lord your God undertook to do for you, have come to you, so the Lord will send down on you all the evil things till he has made your destruction complete, and you are cut off from the 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 sent for the people to be present at the offerings made to their gods; and the people took part in their feasts and gave honour to their gods.
Deuteronomy 13:1
If ever you have among you a prophet or a dreamer of dreams and he gives you a sign or a wonder,
Deuteronomy 17:2
If there is any man or woman among you, in any of the towns which the Lord your God gives you, who does evil in the eyes of the Lord your God, sinning against his agreement,
Deuteronomy 18:20
But the prophet who takes it on himself to say words in my name which I have not given him orders to say, or who says anything in the name of other gods, will come to his death.

Utterly

Numbers 21:3
And the Lord, in answer to the voice of Israel, gave the Canaanites up to them; and they put them and their towns completely to destruction: and that place was named Hormah.
Joshua 23:15
And you will see that, as all the good things which the Lord your God undertook to do for you, have come to you, so the Lord will send down on you all the evil things till he has made your destruction complete, and you are cut off from the good land which the Lord your God has given you.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain