What does justification by faith mean according to the Bible?

The doctrine of justification is pivotal in Reformed theology, underscoring that individuals are made right with God solely through faith in Jesus Christ. Genesis 15:6 demonstrates this with Abraham's belief being credited as righteousness. Paul's epistles elaborate that this is not due to any human efforts or merits but solely by God's grace (Romans 4:5). Justification is a legal declaration by God, signifying that all the believer's sins are forgiven, and they are counted as righteous before Him because of Christ's atoning work on the cross. This underscores the importance of faith in the ongoing relationship between God and His people.