'Enemy' in the Bible

“You have heard that it was said, ‘You shall love your neighbor (fellow man) and hate your enemy.’

But while his men were sleeping, his enemy came and sowed weeds [resembling wheat] among the wheat, and went away.

He replied to them, ‘An enemy has done this.’ The servants asked him, ‘Then do you want us to go and pull them out?’

and the enemy who sowed them is the devil, and the harvest is the end of the age; and the reapers are angels.