1 Corinthians 15:33

Be not deceived; evil companionships corrupt good morals.

Ephesians 5:11

and have no fellowship with the unfruitful works of darkness, but rather even reprove them;

Titus 1:15

To the pure all things are pure; but to the defiled and unbelieving nothing is pure; but both their mind and their conscience have become defiled.

Treasury of Scripture Knowledge

Summary

Every bed, whereon he lieth that hath the issue, is unclean: and every thing, whereon he sitteth, shall be unclean.

Bible References

Be unclean

1 Corinthians 15:33
Be not deceived; evil companionships corrupt good morals.
Ephesians 5:11
and have no fellowship with the unfruitful works of darkness, but rather even reprove them;
Titus 1:15
To the pure all things are pure; but to the defiled and unbelieving nothing is pure; but both their mind and their conscience have become defiled.