Contradiction with Matthew 5:9
Ezekiel 21:7 talks about destruction and wrath, whereas Matthew 5:9 blesses peacemakers and promotes peace.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with Isaiah 54:17
While Ezekiel 21:7 speaks of a pending calamity and destruction, Isaiah 54:17 promises that no weapon formed against God's people shall prosper.
Isaiah 54:17: No weapon that is formed against thee shall prosper; and every tongue [that] shall rise against thee in judgment thou shalt condemn. This [is] the heritage of the servants of the LORD, and their righteousness [is] of me, saith the LORD.
Contradiction with Romans 8:28
Ezekiel 21:7 suggests fear and trembling at judgment, whereas Romans 8:28 speaks about all things working together for good for those who love God.
Romans 8:28: And we know that all things work together for good to them that love God, to them who are the called according to [his] purpose.
Contradiction with Psalm 23:4
Although Ezekiel 21:7 is about fear and trembling, Psalm 23:4 emphasizes fearing no evil because God is with us, providing comfort.
Psalm 23:4: Yea, though I walk through the valley of the shadow of death, I will fear no evil: for thou [art] with me; thy rod and thy staff they comfort me.
Contradiction with Jeremiah 29:11
Ezekiel 21:7 speaks of terror and calamity, but Jeremiah 29:11 declares that God plans to give hope and a future, not harm.
Jeremiah 29:11: For I know the thoughts that I think toward you, saith the LORD, thoughts of peace, and not of evil, to give you an expected end. [expected...: Heb. end and expectation]