'Contaminating' in the Bible

Therefore, if anyone cleanses himself from these things [which are dishonorable—disobedient, sinful], he will be a vessel for honor, sanctified [set apart for a special purpose and], useful to the Master, prepared for every good work.

And the tongue is [in a sense] a fire, the very world of injustice and unrighteousness; the tongue is set among our members as that which contaminates the entire body, and sets on fire the course of our life [the cycle of man’s existence], and is itself set on fire by hell (Gehenna).