'Your Enemy' in the Bible

They brought the head of Ish-bosheth to David at Hebron, and said to the king, “Look, the head of Ish-bosheth the son of Saul, your enemy, who sought your life; thus the Lord has granted my lord the king vengeance this day on Saul and on his descendants.”

Gad went to David and told him, "Shall seven years of famine come upon your land? Or shall you flee for three months from your enemy with him in hot pursuit? Or shall there be three days of plague in your land? Now decide what I should tell the one who sent me."