'Revenge' in the Bible

Then Saul replied, “Say this to David: ‘The king desires no other bride-price except 100 Philistine foreskins, to take revenge on his enemies.’” Actually, Saul intended to cause David’s death at the hands of the Philistines.

there will not be remorse or a troubled conscience for my lord because of needless bloodshed or my lord’s revenge. And when the Lord does good things for my lord, may you remember me your servant.”