'Law' in the Bible

Desiring to be teachers of the law; understanding neither what they say, nor whereof they affirm.

But we know that the law is good, if a man use it lawfully;

Knowing this, that the law is not made for a righteous man, but for the lawless and disobedient, for the ungodly and for sinners, for unholy and profane, for murderers of fathers and murderers of mothers, for manslayers,