Contradiction with 1 Corinthians 9:12
This verse suggests enduring all things to avoid hindering the gospel, which could be seen as contradicting defending oneself as in 9:3.
1 Corinthians 9:12: If others be partakers of [this] power over you, [are] not we rather? Nevertheless we have not used this power; but suffer all things, lest we should hinder the gospel of Christ.
Contradiction with Matthew 5:11
This verse mentions being blessed when reviled, contrasting with 9:3's implication of self-defense against such.
Matthew 5:11: Blessed are ye, when [men] shall revile you, and persecute [you], and shall say all manner of evil against you falsely, for my sake. [falsely: Gr. lying]
Contradiction with Matthew 5:39
Advises turning the other cheek instead of self-defense, which could contradict the defense in 9:3.
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 1 Peter 2:23
Jesus did not retaliate or defend himself against accusations, differing from the defense mentioned in 9:3.
1 Peter 2:23: Who, when he was reviled, reviled not again; when he suffered, he threatened not; but committed [himself] to him that judgeth righteously: [himself: or, his cause]
Contradiction with 2 Corinthians 11:30
Boasting in infirmities contrasts with the implied defense in 9:3.
2 Corinthians 11:30: If I must needs glory, I will glory of the things which concern mine infirmities.
Contradiction with Romans 12:19
Calls for leaving vengeance to God, possibly contradicting the act of defending oneself in 9:3.
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.