'Righteous' in the Bible

If we confess our sins, He is faithful and righteous to forgive us our sins and to cleanse us from all unrighteousness.

My little children, I am writing these things to you so that you may not sin. And if anyone sins, we have an Advocate with the Father, Jesus Christ the righteous;

If you know that He is righteous, you know that everyone also who practices righteousness is born of Him.

Little children, make sure no one deceives you; the one who practices righteousness is righteous, just as He is righteous;

not as Cain, who was of the evil one and slew his brother. And for what reason did he slay him? Because his deeds were evil, and his brother’s were righteous.