Contradiction with Exodus 20:13
Exodus 20:13 commands "Thou shalt not kill," which contradicts Ezekiel 21:11's readiness of the sword for slaughter.
Exodus 20:13: Thou shalt not kill.
Contradiction with Matthew 5:9
Matthew 5:9 praises peacemakers as "children of God," conflicting with the violent imagery in Ezekiel 21:11.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with Isaiah 2:4
Isaiah 2:4 envisions a future where swords are beaten into plowshares, contrasting with the sharpening of the sword in Ezekiel 21:11.
Isaiah 2:4: And he shall judge among the nations, and shall rebuke many people: and they shall beat their swords into plowshares, and their spears into pruninghooks: nation shall not lift up sword against nation, neither shall they learn war any more. [pruninghooks: or, scythes]
Contradiction with Romans 12:19
Romans 12:19 advises against seeking vengeance, which is at odds with the readiness for battle in Ezekiel 21:11.
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.