Joshua 22:17

Was not the sin of Baal-peor great enough, from which we are not clear even to this day, though punishment came on the people of the Lord,

Numbers 25:1-18

Now when Israel was living in Shittim the people became false to the Lord, doing evil with the daughters of Moab:

Deuteronomy 4:3-4

Your eyes have seen what the Lord did because of Baal-peor: for destruction came from the Lord on all those among you who went after Baal-peor.

Psalm 106:28-29

And they were joined to Baal-peor, and took part in the offerings to the dead.

Ezra 9:13-14

And after everything which has come on us because of our evil-doing and our great sin, and seeing that the punishment which you, O God, have given us, is less than the measure of our sins, and that you have kept from death those of us who are here;

1 Corinthians 10:8

Again, let us not give way to the desires of the flesh, as some of them did, of whom twenty-three thousand came to their end in one day.

1 Corinthians 10:11

Now these things were done as an example; and were put down in writing for our teaching, on whom the last days have come.

Treasury of Scripture Knowledge

Summary

Is the iniquity of Peor too little for us, from which we are not cleansed until this day, although there was a plague in the congregation of the LORD,

Bible References

Is the iniquity

Numbers 25:3
So Israel had relations with the women of Moab in honour of the Baal of Peor: and the Lord was moved to wrath against Israel.
Deuteronomy 4:3
Your eyes have seen what the Lord did because of Baal-peor: for destruction came from the Lord on all those among you who went after Baal-peor.
Psalm 106:28
And they were joined to Baal-peor, and took part in the offerings to the dead.

From which

Ezra 9:13
And after everything which has come on us because of our evil-doing and our great sin, and seeing that the punishment which you, O God, have given us, is less than the measure of our sins, and that you have kept from death those of us who are here;
1 Corinthians 10:8
Again, let us not give way to the desires of the flesh, as some of them did, of whom twenty-three thousand came to their end in one day.

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