2 Samuel 3:29 - Matthew Poole's English Annotations on the Holy Bible

Let it rest, i.e. this blood, the guilt and punishment of it. And on all his father's house. But children were not to suffer for their parent's sin, Deuteronomy 24:16; and therefore either this was only a prediction; or, if it were an imprecation, David may seem to have transgressed his bounds, and mingled his passion with his zeal, that so he might express his utter detestation of this horrid murder, and how far he was from having any hand in it. An issue was not only a troublesome and shameful disease, but also infectious, both to him that had it, and to all that touched him; so that whilst it was upon a man, he was cut off in a great part from converse either with God or men. That leaneth on a staff, through craziness, or feebleness, or lameness, whereby he is rendered unfit for action and public service.