What does the Bible say about the believer's righteousness?

The Bible teaches that the only one who has ever walked uprightly and fulfilled the law perfectly is the Lord Jesus Christ. As believers, our righteousness is not based on our own efforts but is attributed to us through Christ's obedience. 2 Corinthians 5:21 states that Christ became sin for us so that we might be made the righteousness of God in Him. Therefore, believers are viewed as righteous in God's eyes, not because of personal merit, but because of Christ's perfect righteousness imputed to them. This doctrine underscores the grace of God in saving His people without any contribution from them, as they cannot earn their own righteousness.