The term “righteous” or “righteousness” is used many times in the KJV Bible…
1. Old Testament words:
tsaddiyq – to be lawful, aligned with the law
yashar – to be straight or aligned
2. New Testament words:
dikaios – to be right, straight
The idea is this… to be in an excellent condition, to be aligned with the law, to be right. It speaks of the condition of being “aligned with God’s law”. In the case of man, this righteousness makes us “right” (at peace with and accepted by) God.
Here are a few samples of Biblical usage….
This term is used to describe an attribute of the Lord:
“Oh let the wickedness of the wicked come to an end; but establish the just: for the righteous God trieth the hearts and reins.” (Psalms 7:9)
This teaches us of the Lord’s perfection and His justice.
This term also speaks of an attribute that is absent from fallen mankind.
“As it is written, There is none righteous, no, not one: There is none that understandeth, there is none that seeketh after God. (Romans 3:10-11)
But can be obtained through faith in the Lord Jesus Christ and His work on the cross.
“For he hath made him [to be] sin for us, who knew no sin; that we might be made the righteousness of God in him.” (2 Corinthians 5:21)
“Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law [is] the knowledge of sin. But now the righteousness of God without the law is manifested, being witnessed by the law and the prophets; Even the righteousness of God [which is] by faith of Jesus Christ unto all and upon all them that believe: for there is no difference: For all have sinned, and come short of the glory of God;” (Romans 3:20-23)