'Enemy' in the Bible

'Ye heard that it was said: Thou shalt love thy neighbour, and shalt hate thine enemy;

and, while men are sleeping, his enemy came and sowed darnel in the midst of the wheat, and went away,

And he saith to them, A man, an enemy, did this; and the servants said to him, Wilt thou, then, that having gone away we may gather it up?

and the enemy who sowed them is the devil, and the harvest is a full end of the age, and the reapers are messengers.