1 Corinthians 5:6

It is no good thing--this which you make the ground of your boasting. Do you not know that a little yeast corrupts the whole of the dough?

1 Corinthians 15:33

Do not deceive yourselves: "Evil companionships corrupt good morals."

Treasury of Scripture Knowledge

Summary

But were mingled among the heathen, and learned their works.

Bible References

Learned

1 Corinthians 5:6
It is no good thing--this which you make the ground of your boasting. Do you not know that a little yeast corrupts the whole of the dough?
1 Corinthians 15:33
Do not deceive yourselves: "Evil companionships corrupt good morals."