Exodus 22:20

" 'Whoever sacrifices to the gods--not to Yahweh, to him alone--will be destroyed.

Deuteronomy 17:2-5

If [there] is found in one of your {towns} that Yahweh your God [is] giving to you a man or a woman that does evil in the eyes of Yahweh your God to transgress his covenant

Numbers 25:7-8

When Phinehas son of Eleazar son of Aaron the priest saw, he got up from the midst of the community and took a spear in his hand.

Deuteronomy 13:1-15

"If a prophet stands up in your midst or a dreamer of dreams and he gives to you a sign or wonder,

Deuteronomy 18:20

However, the prophet that behaves presumptuously by speaking a word in my name that I have not commanded him to speak, and who speaks in the name of other gods, then that prophet shall die.'

Numbers 21:3

Yahweh heard the voice of Israel; he gave [to them] the Canaanites, and {they destroyed them} and their cities. They called the name of the place Hormah.

Numbers 25:2-4

And they invited the people to the sacrifices of their gods, and the people ate and worshiped their gods.

Joshua 23:15-16

But just as all the good things came to you that Yahweh your God promised, so will Yahweh bring to you all the bad things until he has destroyed you from this good land that Yahweh your God has given to 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
And they invited the people to the sacrifices of their gods, and the people ate and worshiped their gods.
Deuteronomy 13:1
"If a prophet stands up in your midst or a dreamer of dreams and he gives to you a sign or wonder,
Deuteronomy 17:2
If [there] is found in one of your {towns} that Yahweh your God [is] giving to you a man or a woman that does evil in the eyes of Yahweh your God to transgress his covenant
Deuteronomy 18:20
However, the prophet that behaves presumptuously by speaking a word in my name that I have not commanded him to speak, and who speaks in the name of other gods, then that prophet shall die.'

Utterly

Numbers 21:3
Yahweh heard the voice of Israel; he gave [to them] the Canaanites, and {they destroyed them} and their cities. They called the name of the place Hormah.
Joshua 23:15
But just as all the good things came to you that Yahweh your God promised, so will Yahweh bring to you all the bad things until he has destroyed you from this good land that Yahweh your God has given to you.