'Revenge' in the Bible

O LORD, thou knowest: remember me, and visit me, and revenge me of my persecutors; take me not away in thy longsuffering: know that for thy sake I have suffered rebuke.

For I heard the defaming of many, fear on every side. Report, say they, and we will report it. All my familiars watched for my halting, saying, Peradventure he will be enticed, and we shall prevail against him, and we shall take our revenge on him.

Thus saith the Lord GOD; Because the Philistines have dealt by revenge, and have taken vengeance with a despiteful heart, to destroy it for the old hatred;

For behold this selfsame thing, that ye sorrowed after a godly sort, what carefulness it wrought in you, yea, what clearing of yourselves, yea, what indignation, yea, what fear, yea, what vehement desire, yea, what zeal, yea, what revenge! In all things ye have approved yourselves to be clear in this matter.

And having in a readiness to revenge all disobedience, when your obedience is fulfilled.