'Enemy' in the Bible

Thy right hand, Jehovah, is become glorious in power: Thy right hand, Jehovah, hath dashed in pieces the enemy.

The enemy said, I will pursue, I will overtake, I will divide the spoil; my soul shall be sated upon them; I will unsheath my sword, my hand shall dispossess them.

But if thou shalt diligently hearken unto his voice, and do all that I shall say, then I will be an enemy to thine enemies, and an adversary to thine adversaries.