Q.36: What is justification?
A. Justification is an act of God’s free grace, wherein He pardons all our sins, and accepts us as righteous in His sight, only for the righteousness of Christ imputed to us, and received by faith alone.
Being justified freely by His grace through the redemption that is in Christ Jesus, whom God set forth as a propitiation by His blood, through faith, to demonstrate His righteousness, because in His forbearance God had passed over the sins that were previously committed. Romans 3:24-25
Just as David also describes the blessedness of the man to whom God imputes righteousness apart from works: “Blessed are those whose lawless deeds are forgiven, And whose sins are covered; Blessed is the man to whom the LORD shall not impute sin.” Romans 4:6-8