Augustine of Hippo, on 2Sam 19:1

“And it was told Joab, that the king wept and mourned for his son:”

“But when king David had suffered this injury at the hands of his impious and unnatural son, he not only bore with him in his mad passion but mourned over him in his death. He certainly was not caught in the meshes of carnal jealousy, seeing that it was not his own injuries but the sins of his son that moved him. For it was on this account he had given orders that his son should not be slain if he were conquered in battle, that he might have a place of repentance after he was subdued. When he was baffled in this design, he mourned over his son's death, not because of his own loss but because he knew to what punishment so impious an adulterer and parricide had been hurried.”

Imported from an open dataset — not yet checked against the printed edition.