2 Samuel 3
Ambrose of Milan · Comentário Patrístico (catena)
2 Samuel 3:20
He had bound the people to himself freely in doing his duty; first, when during the division among the people he preferred to live like an exile at Hebron rather than to reign at Jerusalem; next, when he showed that he loved valor even in an enemy. He had also thought that justice should be shown to those who had borne arms against himself the same as to his own men. Again, he admired Abner, the bravest champion of the opposing side, while he was their leader and was yet waging war. Nor did he despise Abner when suing for peace, but honored him by a banquet. When killed by treachery, David mourned and wept for him. He followed him and honored his obsequies and evinced his good faith in desiring vengeance for the murder; for he handed on that duty to his son in the charge that he gave him, being anxious rather that the death of an innocent man should not be left unavenged than that any one should mourn for his own. — On the Duties of the Clergy 2.7.33
2 Samuel 3:28
Although he [Saul] was a king, he sinned if he killed the innocent. Finally, even David, when he was in possession of his kingdom and had heard that an innocent man named Abner was slain by Joab, the leader of his army, said, "I and my kingdom are innocent now and forever of the blood of Abner the son of Ner," and he fasted in sorrow.These things I have written not to disconcert you but that the example of kings may stir you to remove this sin from your kingdom, for you will remove it by humbling your soul before God. You are a man, you have met temptation—conquer it. Sin is not removed except by tears and penance. No angel or archangel can remove it; it is God himself who alone can say, "I am with you"; if we have sinned, he does not forgive us unless we do penance. — LETTER 51.10-11