Contradiction with Matthew 5:10
This verse blesses those who are persecuted for righteousness' sake, suggesting a positive view of persecution, whereas Isaiah 51:7 says not to fear the reproach of men.
Matthew 5:10: Blessed [are] they which are persecuted for righteousness' sake: for theirs is the kingdom of heaven.
Contradiction with John 15:18
Jesus speaks about the inevitability of being hated by the world, which contrasts with Isaiah 51:7's exhortation not to fear reproach.
John 15:18: If the world hate you, ye know that it hated me before [it hated] you.
Contradiction with 2 Timothy 3:12
This verse states that all who live godly in Christ Jesus will suffer persecution, contrasting with Isaiah 51:7's message of not being afraid of men's reproach or reviling.
2 Timothy 3:12: Yea, and all that will live godly in Christ Jesus shall suffer persecution.
Contradiction with Matthew 10:28
This verse tells not to fear those who kill the body but cannot kill the soul, which could contrast with Isaiah 51:7 by shifting the focus from fearing reproach to fearing God only.
Matthew 10:28: And fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in hell.