1 Corinthians 5:1-6

It is actually reported that there is immorality among you, and such immorality as is not even among the heathen??hat a man has taken his father's wife!

Hebrews 12:15-16

Look carefully that there be no one who falls back from the grace of God; that no root of bitterness springs up to trouble you, and by its means many become defiled.

Treasury of Scripture Knowledge

Summary

But the children of Israel committed a trespass in the accursed thing: for Achan, the son of Carmi, the son of Zabdi, the son of Zerah, of the tribe of Judah, took of the accursed thing: and the anger of the LORD was kindled against the children of Israel.

Bible References

The anger

1 Corinthians 5:1
It is actually reported that there is immorality among you, and such immorality as is not even among the heathen??hat a man has taken his father's wife!
Hebrews 12:15
Look carefully that there be no one who falls back from the grace of God; that no root of bitterness springs up to trouble you, and by its means many become defiled.