'Law' in the Bible

My little children (believers, dear ones), I am writing you these things so that you will not sin and violate God’s law. And if anyone sins, we have an Advocate [who will intercede for us] with the Father: Jesus Christ the righteous [the upright, the just One, who conforms to the Father’s will in every way—purpose, thought, and action].

My loved ones, I do not give you a new law, but an old law which you had from the first; this old law is the word which came to your ears.

Again, I give you a new law, which is true in him and in you; for the night is near its end and the true light is even now shining out.

Whosoever committeth sin transgresseth also the law: for sin is the transgression of the law.

The one who practices sin [separating himself from God, and offending Him by acts of disobedience, indifference, or rebellion] is of the devil [and takes his inner character and moral values from him, not God]; for the devil has sinned and violated God’s law from the beginning. The Son of God appeared for this purpose, to destroy the works of the devil.

And this is his law, that we have faith in the name of his Son Jesus Christ, and love for one another, even as he said to us.