'Adversaries' in the Bible

and David goeth out before them, and answereth and saith to them, 'If for peace ye have come in unto me, to help me, I have a heart to unite with you; and if to betray me to mine adversaries -- without violence in my hands -- the God of our fathers doth see and reprove.'

either for three years -- famine, or three months to be consumed from the face of thine adversaries, even the sword of thine enemies to overtake, or three days the sword of Jehovah, even pestilence in the land, and a messenger of Jehovah destroying in all the border of Israel; and now, see; what word do I return to Him who is sending me?'