But if you will listen carefully to his voice and do everything I say, I will be an enemy to your enemies and a foe to your foes.
KJV
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.
ASV
But if thou shalt indeed hearken unto his voice, and do all that I speak; then I will be an enemy unto thine enemies, and an adversary unto thine adversaries.