Verses with the word unjust in the Old Testament (5 verses):

Psalms 43:1
Judge me, O God, and plead my cause against an ungodly nation: O deliver me from the deceitful and unjust man.

Proverbs 11:7
When a wicked man dieth, his expectation shall perish: and the hope of unjust men perisheth.

Proverbs 28:8
He that by usury and unjust gain increaseth his substance, he shall gather it for him that will pity the poor.

Proverbs 29:27
An unjust man is an abomination to the just: and he that is upright in the way is abomination to the wicked.

Zephaniah 3:5
The just LORD is in the midst thereof; he will not do iniquity: every morning doth he bring his judgment to light, he faileth not; but the unjust knoweth no shame.