'Enemy' in the Bible

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

The enemy said, I will pursue, I will overtake, I will divide the spoil; my lust shall be satisfied upon them; I will draw my sword, my hand shall destroy them.

If thou meet thine enemy's ox or his ass going astray, thou shalt surely bring it back to him again.

If you see the donkey of your enemy lying down under its burden, you will refrain from abandoning him. You will surely arrange [it] with him.

But if thou shalt indeed obey his voice, and do all that I speak; then I will be an enemy unto thine enemies, and an adversary unto thine adversaries.