'Enemy' in the Bible

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

And Saul said unto Michal, Why hast thou deceived me thus, and let mine enemy go, so that he is escaped? And Michal answered Saul, He said unto me, Let me go; why should I kill thee?

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

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

Then said Abishai to David, God hath delivered up thine enemy into thy hand this day: now therefore let me smite him, I pray thee, with the spear to the earth at one stroke, and I will not smite him the second time.