Two of the most important things to God in the Old Testament were justice and righteousness - mishpat and tzedekah.
Justice on the earth is the outcome of God's righteousness from heaven. Although Israel was unable to be either just or righteous, the promised Messiah was to come and be both. And that's exactly what Jesus was. He was perfect before God His Father in heaven - and perfect before His neighbors around Him on earth. And it all culminated with Jesus' death on the cross - the intersection of justice and righteousness once and for all.
“The Lord loves righteousness and justice; the earth is full of the steadfast love of the Lord.” - Psalm 33
“Righteousness and justice are the foundation of your throne; steadfast love and faithfulness go before you.” - Psalm 89
“The Lord of hosts is exalted in justice, and the Holy God shows himself holy in righteousness.” - Isaiah 5
"But now apart from the law the righteousness of God has been made known, to which the Law and the Prophets testify. This righteousness is given through faith in Jesus to all who believe. There is no difference between Jew and Gentile, for all have sinned and fall short of the glory of God, and are justified freely by His grace through the redemption of Christ Jesus. God presented Christ as a sacrifice of atonement through the shedding of His blood to be received by faith. He did this to demonstrate his righteousness, because in his forbearance he had left the sins committed beforehand unpunished. He did this to demonstrate His righteousness at the present time, so as to be just and the one who justifies those who have faith in Jesus." - Romans 3