What does the Bible say about the righteousness of believers?

The Bible emphasizes that true believers are counted as righteous on account of Jesus Christ's perfect sacrifice. In 2 Corinthians 5:21, it is stated that Christ, who knew no sin, was made sin for us, so that we might become the righteousness of God in Him. This means believers are not righteous of themselves but are made righteous through the imputed righteousness of Christ upon trust in Him. The perfect righteousness of Christ is essential for acceptance with God, fulfilling the requirement of holiness demanded by a holy God.