'Enemy' in the Bible

And Saul was yet the more afraid of David; and Saul was David's enemy continually.

Then Saul said to Michal, Why hast thou deceived me so, and sent away mine enemy, that he is escaped? And Michal said to Saul, He said to me, Let me go; why should I slay thee?

And David's men said to him, Behold the day of which Jehovah said to thee, Behold, I will give thine enemy into thy hand, that thou mayest do to him as it shall seem good to thee. And David arose, and cut off the skirt of Saul's robe secretly.

For if a man find his enemy, will he let him go well away? wherefore Jehovah reward thee good for that thou hast done to me this day.

And Abishai said to David, God has delivered thine enemy into thy hand this day; and now let me smite him, I pray thee, with the spear, even to the ground once, and I will not do it the second time.

And Samuel said, Why then dost thou inquire of me, seeing Jehovah is departed from thee, and is become thine enemy?