Exodus 22:20

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

Deuteronomy 17:2-5

“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,

Numbers 25:7-8

When Phinehas the son of Eleazar, the son of Aaron the priest, saw this, he left the congregation and took a spear in his hand,

Deuteronomy 13:1-15

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

Deuteronomy 18:20

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.’

Numbers 21:3

The Lord heard the voice of Israel and handed over the Canaanites; then they utterly destroyed them and their cities. So the name of the place was called Hormah (dedicate to destruction).

Numbers 25:2-4

For they invited the Israelites to the sacrifices of their gods, and the Israelites ate [food offered to idols] and bowed down to Moab’s gods.

Joshua 23:15-16

It shall come about that just as every good word which the Lord your God spoke and promised to you has been fulfilled for you, so the Lord will bring upon you every bad thing [about which He warned you], until He has destroyed and eliminated you from 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 Israelites to the sacrifices of their gods, and the Israelites ate [food offered to idols] and bowed down to Moab’s gods.
Deuteronomy 13:1
“If a prophet arises among you, or a dreamer of dreams, and gives you a sign or a wonder,
Deuteronomy 17:2
“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,
Deuteronomy 18:20
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.’

Utterly

Numbers 21:3
The Lord heard the voice of Israel and handed over the Canaanites; then they utterly destroyed them and their cities. So the name of the place was called Hormah (dedicate to destruction).
Joshua 23:15
It shall come about that just as every good word which the Lord your God spoke and promised to you has been fulfilled for you, so the Lord will bring upon you every bad thing [about which He warned you], until He has destroyed and eliminated you from this good land which the Lord your God has given you.