'Enemy' in the Bible

then Saul was even more afraid of David. Thus Saul was David’s enemy continually.

So Saul said to Michal, “Why have you deceived me like this and let my enemy go, so that he has escaped?” And Michal said to Saul, “He said to me, ‘Let me go! Why should I put you to death?’”

The men of David said to him, “Behold, this is the day of which the Lord said to you, ‘Behold; I am about to give your enemy into your hand, and you shall do to him as it seems good to you.’” Then David arose and cut off the edge of Saul’s robe secretly.

For if a man finds his enemy, will he let him go away safely? May the Lord therefore reward you with good in return for what you have done to me this day.

Then Abishai said to David, “Today God has delivered your enemy into your hand; now therefore, please let me strike him with the spear to the ground with one stroke, and I will not strike him the second time.”