'Enemy' in the Bible

And thou shalt see an enemy in my habitation, in all the wealth which God shall give Israel: and there shall not be an old man in thine house for ever.

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

And Saul said unto Michal, Why hast thou deceived me so, and sent away mine enemy, 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 the LORD said unto thee, Behold, I will deliver thine enemy into thine hand, that thou mayest 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 the LORD reward thee good for that thou hast done unto me this day.

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

Then said Samuel, Wherefore then dost thou ask of me, seeing the LORD is departed from thee, and is become thine enemy?