How do we know the righteousness of servants is from God?

Isaiah 54:17 states explicitly that 'their righteousness is of me, saith the Lord.' This proclamation emphasizes that the righteousness of believers is not self-derived but solely given by God through faith in Jesus Christ. In the New Testament, this concept is further expounded where we learn that Christ’s perfect life and sacrificial death are credited to believers, enabling them to stand faultless before God. Therefore, our righteousness is positional and reflects Christ’s work on our behalf.