Contradiction with Matthew 5:39
While Ezekiel 21:17 mentions striking hands together, Matthew 5:39 teaches to turn the other cheek instead of retaliating.
Matthew 5:39: But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.
Contradiction with Romans 12:19
Ezekiel 21:17 depicts an expression of divine wrath, whereas Romans 12:19 advises leaving vengeance to God and not acting on it personally.
Romans 12:19: Dearly beloved, avenge not yourselves, but [rather] give place unto wrath: for it is written, Vengeance [is] mine; I will repay, saith the Lord.
Contradiction with James 1:20
Ezekiel 21:17 involves an act of anger, yet James 1:20 indicates human anger does not produce God's righteousness.
James 1:20: For the wrath of man worketh not the righteousness of God.