'Enemy' in the Bible

Saul {was threatened by David still more}, so Saul {became a perpetual enemy of David}.

Then Saul said to Michal, "Why have you deceived me like this and sent away my enemy, so that he escaped?" Michal said to Saul, "He said to me, 'Let me go, why should I kill you?'"

And David's men said to him, "Look, today [is] the day about which Yahweh said to you, 'See, I am giving your enemy into your hand, and you can do to him {whatever seems good to you}.'" So David got up and secretly cut the hem of Saul's robe.

For a man has found his enemy but sent him on [his] way safely. Now may Yahweh reward you with good in return for this day, for what you have done for me.

Should a man arise to pursue you and to seek your life, may the life of my lord be wrapped in the pouch of the living with Yahweh your God. But as for the life of your enemy, he will sling it from within the pocket of the sling!

Then Abishai said to David, "God has handed over your enemy into your hand today! So then, {please let me pin him to the ground with the spear} {one time}, and {I will not strike him twice}."

Then Samuel said, "Why do you ask me, since Yahweh has turned away from you and has become your enemy?