'Revenge' in the Bible

For I have heard the defaming of many, terror on every side. Denounce, and we will denounce him,'say all my familiar friends, they that watch for my fall; peradventure he will be persuaded, and we shall prevail against him, and we shall take our revenge on him.

Thus saith the Lord Jehovah: Because the Philistines have dealt by revenge, and have taken vengeance with despite of soul to destroy with perpetual enmity;