Contradiction with Proverbs 27:2
This verse advises to let another praise you and not your own mouth, which contrasts with 2 Corinthians 3:1 where Paul discusses whether they commend themselves again.
Proverbs 27:2: Let another man praise thee, and not thine own mouth; a stranger, and not thine own lips.
Contradiction with Matthew 6:1
This verse warns against doing good deeds before others to be seen by them, contrasting with the idea of self-recommendation mentioned in 2 Corinthians 3:1.
Matthew 6:1: Take heed that ye do not your alms before men, to be seen of them: otherwise ye have no reward of your Father which is in heaven. [alms: or, righteousness] [of your: or, with your]
Contradiction with Galatians 1:10
This verse suggests seeking human approval is not compatible with serving Christ, contrasting with the question of commendation in 2 Corinthians 3:1.
Galatians 1:10: For do I now persuade men, or God? or do I seek to please men? for if I yet pleased men, I should not be the servant of Christ.
Contradiction with Romans 12:3
This verse calls for humility and not thinking of oneself more highly than one ought, which appears to contradict the self-commendation aspect in 2 Corinthians 3:1.
Romans 12:3: For I say, through the grace given unto me, to every man that is among you, not to think [of himself] more highly than he ought to think; but to think soberly, according as God hath dealt to every man the measure of faith. [soberly: Gr. to sobriety]