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

 He speaks of God, our Saviour. This is a new way of speaking. We do not find this title for God in any of Paul's earlier letters. There are two backgrounds from which it comes. 