When you look at Jesus, you understand what it means that God is just as is written in the Belgic Confession (Article 20): We believe that God, who is perfectly merciful and just, sent his Son to assume that nature in which disobedience had been committed, to make satisfaction in that same nature; and to bear the punishment of sin by his most bitter passion and death. God therefore manifested his justice against his Son when he laid our iniquity on him, and poured out his goodness and mercy on us, who were guilty and worthy of damnation. Out of a most perfect love he gave his Son to die for us and he raised him for our justification that through him we might obtain immortality and life eternal.
33 So shall their blood come back on the head of Joab and on the head of his descendants forever. But for David and for his descendants and for his house and for his throne there shall be peace from the LORD forevermore.”