'Enemy' in the Bible

Saul said to Michal, "Why have you deceived me this way by sending my enemy away? Now he has escaped!" Michal replied to Saul, "He said to me, 'Help me get away or else I will kill you!'"

David's men said to him, "This is the day about which the Lord said to you, 'I will give your enemy into your hand, and you can do to him whatever seems appropriate to you.'" So David got up and quietly cut off an edge of Saul's robe.

Now if a man finds his enemy, does he send him on his way in good shape? May the Lord repay you with good this day for what you have done to me.

Abishai said to David, "Today God has delivered your enemy into your hands. Now let me drive the spear right through him into the ground with one swift jab! A second jab won't be necessary!"

Samuel said, "Why are you asking me, now that the Lord has turned away from you and has become your enemy?