New Revised Standard Version
But if you listen attentively to his voice and do all that I say, then I will be an enemy to your enemies and a foe to your foes.

Contemporary English Version
If you faithfully obey him, I will be a fierce enemy of your enemies.

New American Bible
If you obey him and carry out all I tell you, I will be an enemy to your enemies and a foe to your foes.

Douay-Rheims Bible
But if thou wilt hear hi voice, and do all that I speak, I will be an enemy to thy enemies, and will afflict them that afflict thee.

But if thou wilt hear hi voice, and do all that I speak, I will be an enemy to thy enemies, and will afflict them that afflict thee.

an enemy

Genesis 12:3 I will bless them that bless thee, and curse them that curse thee, and IN THEE shall all the kindreds of the earth be blessed.

Numbers 24:9 Lying down he hath slept as a lion, and as a lioness, whom none shall dare to rouse. He that blesseth thee, shall also himself be blessed: he that curseth thee shall be reckoned accursed.

Deuteronomy 30:7 And he will turn all these curses upon thy enemies, and upon them that hate and persecute thee.

Jeremiah 30:20 And their children shall be as from the beginning, and their assembly shall be permanent before me: and I will visit against all that afflict them.

Zechariah 2:8 For thus saith the Lord of hosts: After the glory he hath sent me to the nations that have robbed you: for he that toucheth you, toucheth the apple of my eye:

Acts 9:4,5 And falling on the ground, he heard a voice saying to him: Saul, Saul, why persecutest thou me? . . .

an adversary unto thing adversaries.