'Righteous' in the Bible

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

My children, these things I write to you in order that ye may not sin; and if any one sin, we have a patron with the Father, Jesus Christ the righteous;

If ye know that he is righteous, know that every one who practises righteousness is begotten of him.

Children, let no man lead you astray; he that practises righteousness is righteous, even as he is righteous.

not as Cain was of the wicked one, and slew his brother; and on account of what slew he him? because his works were wicked, and those of his brother righteous.