Contradiction with Proverbs 22:16
While Proverbs 22:22 says not to oppress the poor, Proverbs 22:16 suggests that one who oppresses the poor to increase wealth may still end up in poverty, implying a punishment rather than prohibition.
Proverbs 22:16: He that oppresseth the poor to increase his [riches, and] he that giveth to the rich, [shall] surely [come] to want.
Contradiction with Ecclesiastes 5:8
This verse discusses the pervasiveness of oppression and injustice by the powerful, implying that witnessing such acts should not surprise us, which contrasts the message in Proverbs 22:22 of not oppressing the poor.
Ecclesiastes 5:8: If thou seest the oppression of the poor, and violent perverting of judgment and justice in a province, marvel not at the matter: for [he that is] higher than the highest regardeth; and [there be] higher than they. [at the... Heb. at the will, or, purpose]
Contradiction with Psalm 73:3-5
These verses describe the prosperity of the wicked and oppressors, contradicting the message that oppressing should not occur, suggesting that oppressors seem to thrive as opposed to facing admonishment.
Psalm 73:3-5: For I was envious at the foolish, [when] I saw the prosperity of the wicked.