“[David] orders Solomon to punish [Joab], not out of viciousness or hatred for him but because he knew that he was wicked and that, if he had acted with hostility against him who was a mature man, he would act even worse against a young man, so that the kingdom would become unstable, and the house would not be firmly established. Therefore he entrusts his son with the revenge against him who had offended him, in order that, after the killing of that evil man by the hand of the new king, he might be feared by everyone, and no revolt might ever occur.”

“After expounding the crimes of Joab and Shimei, David entrusts Solomon with their punishment, but only gives him few details about the manner and quality of the punishment: "You will do," he says, "according to your wisdom." It is as if he said, Since both Joab and Shimei committed such [terrible] actions, it is unlawful that they are left unpunished. Therefore, solve this matter with the help of your wisdom so that your equity may catch them in their iniquity: may your severity, with the revelation of new crimes, find out the sins that your father's indulgence had hidden.”

“By Abel we understand the Christian who cleaves to God, as David says: "It is good for me to adhere to my God," that is, to attach oneself to heavenly things and to shun the earthly. Elsewhere he says, "My soul has fainted in your word," thus indicating his rule of life was directed toward reflections on the Word and not on the pleasures of this world. Wherefore we realize that what we read concerning David in the book of Kings is not an idle statement but is said with due weight and reflection: "And he was laid with his fathers." We are given to understand that his faith was like that of his father's. It is clear, then, that there is reference here to participation in life and not to the burial of a body.”

“Some people blame Solomon because he killed his brother. Now the ways of life of people are different. Some of them certainly practice the highest form of philosophy; others pursue that virtue which is called political or civil; others manage the kingdom or hold power militarily. It is necessary to judge each of them according to the way of life that they follow. Therefore an apostolic or prophetic perfection cannot be expected from Solomon, but only those actions that are appropriate to kings. He knew that Adonijah desired to gain supreme command. In fact, he had tried to take hold of the kingdom. When he attacked him the first time openly, he still forgave him and promised him that he would be safe if he behaved with modesty. But after he asked for the partner of his father, he did not grant this to him because Adonijah was opening the way to tyranny. Therefore Solomon ordered him to be killed, as he was concerned for the tranquility of his kingdom.”

“Joab runs to the tent for two reasons: first of all, in order to escape his death, if possible; second, because he imagined that, if he were killed in that place, the tent of God would become polluted as a consequence of his death, and the people would rise up against Solomon, so that, since he had not been able to harm him during his life, he conspired to cause a rebellion at his death. This can be compared with what the demons who entered the swine did in order that the owners of the herd might become enraged and might kill our Lord; but it did not happen as they had planned. That is why Solomon, in the same manner, acting in accordance with the commandment of the law, "Take him, who has sinned, from my altar for execution," forcing Joab to get out so that the innocent blood which he had shed without reason was avenged.”

“You can see here four people who were condemned by Solomon because they were guilty of treason: they all foreshadowed the Jewish nation's ruin, which would derive from Christ's unjust killing. Adonijah, who was appointed as king and was killed shortly later, was the first to presage the fall of the Jewish kingdom; then, after the abrogation of the priesthood of Aaron, Abiathar was expelled from his office; and Joab, who had the dignity of captain of the army, was deprived of his life by the leaders of the people and all his military force was destroyed. Finally, Shimei expressed in an even more evident and definitive manner the sin and punishment of the Jews, especially of the inhabitants of Jerusalem who blasphemed Christ and demanded his crucifixion. And that last prayer of Christ, like a supreme commandment, was postponed for four more decades and was not inflicted until the Jews were caught in a new crime when they persecuted the apostles and the other disciples of Christ.”