'Righteous' in the Bible

But if we confess our sins, he is faithful and righteous, forgiving us our sins and cleansing us from all unrighteousness.

(My little children, I am writing these things to you so that you may not sin.) But if anyone does sin, we have an advocate with the Father, Jesus Christ the righteous One,

If you know that he is righteous, you also know that everyone who practices righteousness has been fathered by him.

Little children, let no one deceive you: The one who practices righteousness is righteous, just as Jesus is righteous.

not like Cain who was of the evil one and brutally murdered his brother. And why did he murder him? Because his deeds were evil, but his brother's were righteous.