How do we know righteousness is imputed to believers?

Righteousness is imputed to believers, as demonstrated in Romans 4, where Paul explains the blessedness of the one to whom God does not impute sin, but rather imparts righteousness. This is evident in the case of David, who, despite his sins, was declared blessed because his sins were covered, and his unrighteousness was not charged to him. The act of imputation reveals not only God’s grace but also His justice, fulfilling the requirement for perfect righteousness through Jesus Christ, who bore our sins and provided us with His righteousness.