Definition and Nature
God's righteousness is a fundamental attribute of His divine nature, reflecting His moral perfection, justice, and faithfulness. It is the standard by which He governs the universe and interacts with His creation. God's righteousness is intrinsic to His character, meaning it is not derived from any external source but is inherent to His being.

Biblical Foundation
The concept of God's righteousness is woven throughout the Scriptures, emphasizing His role as the ultimate judge and lawgiver. In the Old Testament, the Hebrew word for righteousness, "tsedeq," often appears in contexts of justice and moral integrity. In the New Testament, the Greek term "dikaiosyne" conveys a similar meaning, highlighting God's just nature and His actions in accordance with His will.

Old Testament References
In the Old Testament, God's righteousness is frequently associated with His covenantal faithfulness and His deliverance of Israel. For instance, in Psalm 11:7 , it is written, "For the LORD is righteous; He loves justice. The upright will see His face." This verse underscores God's love for justice and His commitment to righteousness.

The prophet Isaiah also speaks extensively about God's righteousness. Isaiah 51:6 declares, "Lift up your eyes to the heavens, and look at the earth beneath; for the heavens will vanish like smoke, the earth will wear out like a garment, and its inhabitants will die like gnats. But My salvation will last forever, and My righteousness will never fail." Here, God's righteousness is portrayed as eternal and unchanging, in contrast to the transient nature of the world.

New Testament References
In the New Testament, God's righteousness is revealed through the person and work of Jesus Christ. Romans 1:17 states, "For the gospel reveals the righteousness of God that comes by faith from start to finish, just as it is written: 'The righteous will live by faith.'" This passage highlights the revelation of God's righteousness through the gospel and the role of faith in receiving it.

The apostle Paul further elaborates on this theme in Romans 3:21-22 : "But now, apart from the law, the righteousness of God has been revealed, as attested by the Law and the Prophets. And this righteousness from God comes through faith in Jesus Christ to all who believe." Here, God's righteousness is made accessible to humanity through faith in Christ, apart from the works of the law.

Theological Implications
God's righteousness has profound theological implications for understanding salvation, justice, and human conduct. It assures believers of God's just nature and His commitment to uphold justice. Moreover, it provides the basis for the doctrine of justification, where believers are declared righteous through faith in Christ, as seen in 2 Corinthians 5:21 : "God made Him who knew no sin to be sin on our behalf, so that in Him we might become the righteousness of God."

Practical Application
Believers are called to reflect God's righteousness in their lives by pursuing justice, mercy, and humility. Micah 6:8 instructs, "He has shown you, O man, what is good. And what does the LORD require of you but to act justly, to love mercy, and to walk humbly with your God?" This verse encapsulates the ethical response to God's righteousness, urging believers to embody these virtues in their daily lives.

Conclusion
God's righteousness is a central theme in the Bible, revealing His moral perfection and justice. It is through His righteousness that believers find assurance of salvation and a model for righteous living.