Exodus 23:22

Overview - Exodus 23
Of slander, false witness, and partiality.
Of charitableness.
Of justice in judgment.
Of taking bribes.
Of oppressing a stranger.
10 Of the year of rest.
12 Of the sabbath.
13 Of idolatry.
14 Of the three feasts.
18 Of the blood and the fat of the sacrifice.
20 An angel is promised, with a blessing, if they obey him.
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Exodus 23:22  (King James Version)
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.

an enemy
Genesis 12:3 ; Numbers 24:9 ; Deuteronomy 30:7 ; Jeremiah 30:20 ; Zechariah 2:8 ; Acts 9:4 Acts 9:5

an adversary unto thine adversaries or, I will afflict them
that afflict thee.