This post is an excerpt from the book review of Death of Death in the Death of Christ.
The doctrine of justification by faith is the teaching that God pronounces sinners, who are believers, not guilty, based on what Christ has done. God counts our faith as righteousness, based on Christ.
Rom 3:24 Being justified freely by his grace through the redemption that is in Christ Jesus:
Rom 3:25 Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God;
Rom 4:4 Now to him that worketh is the reward not reckoned of grace, but of debt.
Rom 4:5 But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness.